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Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Balance at January 1 $ (366,265) $ (426,982) $ (467,616)
Additions (48,376) (44,270) (48,761)
Dispositions 95,917 104,987 89,395
Balance at December 31 $ (318,724) $ (366,265) $ (426,982)