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Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at January 1 $ (481,980) $ (432,374) $ (388,346)
Additions (57,049) (62,299) (59,208)
Dispositions 71,907 12,693 15,180
Balance at December 31 $ (467,122) $ (481,980) $ (432,374)