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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - 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 and Accumulated Depreciation [Line Items]      
Federal income tax purposes $ 1,800,000    
Real Estate:      
Beginning balance 2,501,844 $ 2,255,260 $ 2,214,057
Additions to/improvements of real estate 153,163 255,527 49,685
Assets sold/written-off (11,942) (8,943) (8,482)
Ending balance 2,643,065 2,501,844 2,255,260
Accumulated Depreciation      
Beginning balance 492,582 429,814 371,563
Depreciation expense 70,592 65,723 60,856
Assets sold/written-off (4,517) (2,955) (2,605)
Ending balance $ 558,657 $ 492,582 $ 429,814
Land improvements      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Useful life 7 years    
Building      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Useful life 50 years    
Buildings and improvements | Minimum      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Useful life 7 years    
Buildings and improvements | Maximum      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Useful life 15 years    
Leasehold improvements      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Useful life 15 years