Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 3)

v2.4.0.6
Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Impairment losses (recoveries) $ 1,857 $ (4,836)
Exit Costs Included in Impairment Losses in Connection with Dispositions 0 (1,108)
Discounted Cash Flow Valuation Technique [Member]
    
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Discount rate   11.00% [1]
Terminal capitalization rate   9.00% [1]
Market rent growth rate   3.00% [1]
Expense growth rate   3.00% [1]
Yield Analysis Valuation Technique [Member]
    
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Yield   12.00% [1]
Market rent rate (in dollars per square foot)   8.50 [1]
Leasing costs (in dollars per square foot)   20.00 [1]
Fair value measurement on a nonrecurring basis | Properties,net
    
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Impairment losses (recoveries) 1,857 [2] 5,479 [2],[3]
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties,net
    
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Fair value on measurement date 7,250 [2],[4] 92,176 [2]
Exit Costs Included in Impairment Losses in Connection with Dispositions   1,100
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties,net
    
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements    
Fair value on measurement date $ 7,250 [2] $ 92,176 [2]
[1] Only one value applied for this unobservable input.
[2] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[3] Represents impairment losses, excluding exit costs incurred of $1.1 million.
[4] This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness.