Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) $ 1,302 $ 0 $ 1,302 $ 0
Fair value measurement on a nonrecurring basis | Properties,net
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) 1,328 [1] 7,195 [1] 1,329 [1] 9,052 [1]
Fair value measurement on a nonrecurring basis | Properties,net | Significant Unobservable Inputs (Level 3)
       
Assets and liabilities measured at fair value on a non-recurring basis        
Assets 9,796 [1] 99,240 [1] 9,796 [1] 99,240 [1]
Fair value measurement on a nonrecurring basis | Properties,net | Total Estimated Fair Value
       
Assets and liabilities measured at fair value on a non-recurring basis        
Assets $ 9,796 [1] $ 99,240 [1] $ 9,796 [1] $ 99,240 [1]
[1] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.