Schedule III - Real Estate and Accumulated Depreciation - Summary of Activity for Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real estate:
Balances at beginning of year	$ 5,638,083	$ 5,851,942	$ 5,840,417
Acquisition of real estate and development and improvements	103,578	173,478	28,050
Disposition of real estate		(197,277)	(16,525)
Impairment	(183,140)	(55,039)
Balances associated with changes in reporting presentation	(28,924)	(135,021)
Balances at end of year	5,529,597	5,638,083	5,851,942
Accumulated depreciation:
Balances at beginning of year	1,019,821	884,378	662,567
Depreciation expense	142,630	221,226	224,901
Disposition of real estate		(42,501)	(3,090)
Impairments	(44,227)	(10,459)
Balances associated with changes in reporting presentation	(6,456)	(32,823)
Balances at end of year	$ 1,111,768	$ 1,019,821	$ 884,378