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Interest Rate Derivatives (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
Interest rate swaps
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Dec. 31, 2010
Interest rate swaps
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Dec. 31, 2009
Interest rate swaps
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Dec. 31, 2011
Designated
Interest rate swap, effective date January 3, 2011
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Dec. 31, 2010
Designated
Interest rate swap, effective date January 3, 2011
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Dec. 31, 2011
Designated
Interest rate swap two, effective date January 3, 2011
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Dec. 31, 2010
Designated
Interest rate swap two, effective date January 3, 2011
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Dec. 31, 2011
Designated
Interest rate swap, effective date January 4, 2011
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Dec. 31, 2010
Designated
Interest rate swap, effective date January 4, 2011
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Dec. 31, 2011
Designated
Interest rate swap, effective date January 2, 2009
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Dec. 31, 2010
Designated
Interest rate swap, effective date January 2, 2009
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Dec. 31, 2011
Designated
Interest rate swap, effective date January 1, 2010
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Dec. 31, 2010
Designated
Interest rate swap, effective date January 1, 2010
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Dec. 31, 2011
Designated
Interest rate swap, effective date November 2, 2010
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Dec. 31, 2010
Designated
Interest rate swap, effective date November 2, 2010
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Dec. 31, 2011
Designated
Interest rate swap, effective date January 3, 2012
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Dec. 31, 2011
Designated
Interest rate swap one, effective date January 3, 2012
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Dec. 31, 2011
Designated
Interest rate swap two, effective date January 3, 2012
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Dec. 31, 2011
Designated
Interest rate swap three, effective date January 3, 2012
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Dec. 31, 2011
Not-designated
Interest rate swap, effective date September 30, 2011
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Jan. 31, 2012
Not-designated
Forward starting swaps entered into on April 5, 2011 and December 22, 2011
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Dec. 31, 2011
Not-designated
Forward starting swaps entered into on April 5, 2011 and December 22, 2011
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Dec. 31, 2011
Not-designated
Interest rate swap two, effective date September 30, 2011
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Dec. 31, 2011
Not-designated
Interest rate swap, effective date December 30, 2011
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Dec. 31, 2011
Not-designated
Interest rate swap two, effective date December 30, 2011
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Apr. 30, 2011
Not-designated
Interest rate swaps, effective date September 30, 2011
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Dec. 31, 2011
Not-designated
Interest rate swaps, effective date September 30, 2011
Y
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Apr. 05, 2011
Not-designated
Interest rate swaps, effective date September 30, 2011
swap
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Dec. 31, 2011
Not-designated
Interest rate swaps, effective date December 30, 2011
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Dec. 22, 2011
Not-designated
Interest rate swaps, effective date December 30, 2011
swap
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| Fair values of interest rate swap derivatives | |||||||||||||||||||||||||||||||||
| Notional Amount | $ 50,000,000 | $ 50,000,000 | $ 50,000,000 | $ 120,000,000 | $ 100,000,000 | $ 39,213,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 175,000,000 | $ 175,000,000 | |||||||||||||||||||||
| Notional Amount | 100,000,000 | 75,000,000 | 100,000,000 | 75,000,000 | |||||||||||||||||||||||||||||
| Fixed rate (as a percent) | 0.5025% | 0.5025% | 0.44% | 1.76% | 1.975% | 3.83% | 0.6123% | 0.61% | 0.832% | 0.832% | 3.8415% | 3.845% | 2.0525% | 2.0525% | |||||||||||||||||||
| Floating rate index | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | One-Month LIBOR | Three-Month LIBOR | Three-Month LIBOR | Three-Month LIBOR-Reverse | Three-Month LIBOR-Reverse | Three-Month LIBOR | Reverse three-month LIBOR | |||||||||||||||||
| Fair value of interest rate swaps | (30,147,000) | (3,582,000) | (1,000) | (64,000) | (1,000) | (64,000) | (34,000) | (552,000) | (2,062,000) | (532,000) | (2,002,000) | (1,054,000) | 644,000 | 55,000 | 56,000 | (66,000) | (49,000) | (16,333,000) | (12,275,000) | 345,000 | 260,000 | ||||||||||||
| Notional amount of interest rate derivatives after scheduled amortization | 36,200,000 | ||||||||||||||||||||||||||||||||
| Cash settlement of the forward starting swaps and interest accrued thereon | 29,700,000 | ||||||||||||||||||||||||||||||||
| Number of swaps | 2 | 2 | |||||||||||||||||||||||||||||||
| Term of fixed-rate borrowings associated with interest rate derivative (in years) | 10 | ||||||||||||||||||||||||||||||||
| Loss on interest rate derivatives | (28,430,000) | (28,430,000) | |||||||||||||||||||||||||||||||
| Loss on interest rate derivatives | 29,805,000 | 29,800,000 | |||||||||||||||||||||||||||||||
| Effect of interest rate derivatives on consolidated statements of operations and comprehensive income | |||||||||||||||||||||||||||||||||
| Amount of loss recognized in AOCL (effective portion) | (31,531,000) | (5,473,000) | (3,253,000) | (31,531,000) | (5,473,000) | (3,253,000) | |||||||||||||||||||||||||||
| Amount of loss reclassified from AOCL into interest expense (effective portion) | (4,601,000) | (3,689,000) | (6,680,000) | (4,601,000) | (3,689,000) | (6,680,000) | |||||||||||||||||||||||||||
| Amount of loss reclassified from AOCL to loss on interest rate derivatives upon discontinuing hedge accounting | 28,430,000 | 28,430,000 | |||||||||||||||||||||||||||||||
| Loss on interest rate derivatives | (1,375,000) | ||||||||||||||||||||||||||||||||
| Amount of loss recognized in interest expense (ineffective portion and amount excluded from effectiveness testing) | (261,000) | ||||||||||||||||||||||||||||||||
| Fair value of interest rate derivatives and balance sheet classification | |||||||||||||||||||||||||||||||||
| Fair value of interest rate swaps classified as prepaid expenses and other assets | 111,000 | 644,000 | |||||||||||||||||||||||||||||||
| Fair value of Interest rate swaps classified as interest rate derivatives | (2,255,000) | (4,226,000) | |||||||||||||||||||||||||||||||
| Fair value of interest rate swaps not designated as hedge classified as prepaid expenses and other assets | 605,000 | ||||||||||||||||||||||||||||||||
| Fair value of interest rate swaps not designated as hedge classified as interest rate derivatives | (28,608,000) | ||||||||||||||||||||||||||||||||
| Approximate amount to be reclassified from AOCL to interest expense over the next 12 months | 2,400,000 | ||||||||||||||||||||||||||||||||
| Interest rate derivatives in liability position, fair value | 30,900,000 | ||||||||||||||||||||||||||||||||
| Termination value to settle obligations under interest rate derivative agreements | $ 33,300,000 | ||||||||||||||||||||||||||||||||