Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation of Accumulated Depreciation (Details)

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Schedule III - Reconciliation of Accumulated Depreciation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance, beginning of year $ 582,859 $ 512,485 $ 453,145
Depreciation for the period 74,695 73,700 66,242
Dispositions and assets held for sale (2,923) (3,326) (6,902)
Balance, end of year $ 654,631 $ 582,859 $ 512,485