Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 2)

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Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Carrying amount and estimated fair value of debt    
Debt, net $ 2,169,315 $ 2,426,303
4.25% Exchangeable Senior Notes
   
Carrying amount and estimated fair value of debt    
Debt, net 230,000 [1] 227,283 [1]
Carrying Amount
   
Carrying amount and estimated fair value of debt    
Variable-rate debt 959,045 1,141,549
Debt, net 2,169,315 2,426,303
Carrying Amount | 4.25% Exchangeable Senior Notes
   
Carrying amount and estimated fair value of debt    
Fixed-rate debt 230,000 227,283
Carrying Amount | Other fixed-rate debt
   
Carrying amount and estimated fair value of debt    
Fixed-rate debt 980,270 1,057,471
Total Estimated Fair Value
   
Carrying amount and estimated fair value of debt    
Variable-rate debt 959,944 1,139,856
Debt, net 2,193,256 2,432,357
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes
   
Carrying amount and estimated fair value of debt    
Fixed-rate debt 240,335 238,077
Total Estimated Fair Value | Other fixed-rate debt
   
Carrying amount and estimated fair value of debt    
Fixed-rate debt $ 992,977 $ 1,054,424
[1] As described further in our 2011 Annual Report on Form 10-K, these notes have an exchange settlement feature that provides that the notes may, under certain circumstances, be exchangeable for cash and, at the Operating Partnership’s discretion, our common shares at an exchange rate (subject to adjustment) of 20.8513 shares per one thousand dollar principal amount of the notes (exchange rate is as of September 30, 2012 and is equivalent to an exchange price of $47.96 per common share). The carrying value of these notes included a principal amount of $240 million and an unamortized discount totaling $10.0 million at September 30, 2012 and $12.7 million at December 31, 2011. The effective interest rate under the notes, including amortization of the issuance costs, was 6.05%. Because the closing price of our common shares at September 30, 2012 and December 31, 2011 was less than the exchange price per common share applicable to these notes, the if-converted value of the notes did not exceed the principal amount. The table below sets forth interest expense recognized on these notes before deductions for amounts capitalized (in thousands): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2012 2011 2012 2011Interest expense at stated interest rate$2,550 $2,550 $7,650 $7,650Interest expense associated with amortization of discount919 866 2,717 2,558Total$3,469 $3,416 $10,367 $10,208