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Schedule III - Real Estate and Accumulated Depreciation (Changes in Total Real Estate Assets and Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule III - Real Estate and Accumulated Depreciation [Abstract]      
Balance, beginning of period $ 7,376,690 $ 7,387,597 $ 6,998,233
Acquisition of operating properties and unconsolidated joint ventures 56,985 0 0
Development and repositions 224,202 278,447 347,429
Improvements 71,889 65,892 66,640
Cost of real estate sold – other (62,023) (355,246) (24,705)
Balance, end of period 7,667,743 7,376,690 7,387,597
Balance, Beginning of period 1,890,656 1,780,694 1,557,004
Depreciation of real estate assets 255,924 243,403 233,955
Dispositions (27,741) (133,441) (10,265)
Balance, End of period 2,118,839 $ 1,890,656 $ 1,780,694
Real Estate, Federal Income Tax Basis $ 6,700,000