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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Reconciliation of Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance, beginning of year $ 556,851 $ 428,930 $ 313,524
Depreciation expense 148,346 148,947 141,516
Impairment (3,494) 0 (833)
Disposals (41,427) (21,026) (25,277)
Balance, end of year $ 660,276 $ 556,851 $ 428,930
Building | Minimum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 20 years    
Building | Maximum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 35 years    
Building Improvements | Minimum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 10 years    
Building Improvements | Maximum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 35 years    
Furniture and Fixtures | Minimum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 5 years    
Furniture and Fixtures | Maximum      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Life used for depreciation (in years) 10 years