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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Total real estate held for investment, beginning of year   $ 6,057,932 $ 5,264,947
Acquisitions $ 384,650 139,123 340,296
Improvements, etc. 452,331 536,411 588,166
Total additions during period 836,981 675,534 928,462
Cost of real estate sold (56,993) (231,984) (113,416)
Properties held for sale (259,251) (160,074) (14,700)
Other [1] (13,184) (13,262) (7,361)
Total deductions during period (329,428) (405,320) (135,477)
Total real estate held for investment, end of year $ 5,264,947 $ 6,328,146 $ 6,057,932
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