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Schedule III - Real Estate And Accumulated Depreciation Property 4 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]      
Development in Process $ 4,975 $ 1,316  
SEC Schedule III, Real Estate, Federal Income Tax Basis 2,814,722    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at beginning of period 2,180,252 2,259,631 $ 3,800,865
Acquisitions and capital improvements 598,843 497,646 484,776
Disposals and write-offs (263,010) (534,458) (220,052)
Properties classified as discontinued operations 0 (42,567) (1,805,958)
Balance at end of period 2,516,085 2,180,252 2,259,631
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance at beginning of period 351,389 394,904 598,440
Depreciation expense, continuing operations 70,959 63,684 66,860
Depreciation expense, properties classified as discontinued operations 974 27,397 66,840
Disposal Group, SEC Schedule III, Real Estate, Accumulated Depreciation 0 (2,601) (272,294)
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold (74,985) (131,995) (64,942)
Balance at end of period $ 348,337 $ 351,389 $ 394,904
Building and improvements [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated lives used to compute depreciation 30 years    
Furniture, fixtures & equipment [Member] | Minimum [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated lives used to compute depreciation 5 years    
Furniture, fixtures & equipment [Member] | Maximum [Member]      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Estimated lives used to compute depreciation 15 years