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Schedule III - Real Estate and Accumulated Depreciation and Amortization Summary (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]      
Total cost basis for federal income tax purposes $ 4,600,000,000    
Reconciliation of real estate owned:      
Balance at the beginning of year 3,564,466,000 3,172,246,000 3,363,586,000
Additions during year 492,437,000 540,847,000 143,382,000
Properties sold during year (212,771,000) (138,041,000) (230,397,000)
Properties impaired during the year (31,741,000) (10,553,000) (103,727,000)
Other reclassifications (97,000) (33,000) (598,000)
Balance at end of year 3,812,294,000 3,564,466,000 3,172,246,000
Reconciliation of accumulated depreciation and amortization:      
Balance at the beginning of year 738,068,000 638,368,000 601,239,000
Depreciation and amortization expense 122,057,000 119,067,000 114,247,000
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year (84,508,000) (19,367,000) (76,939,000)
Other reclassifications 0 0 (179,000)
Balance at end of year $ 775,617,000 $ 738,068,000 $ 638,368,000