Schedule III Schedule III Reconciliation of Gross Real Estate Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance, beginning of year	$ 15,857,507	$ 6,699,547	$ 1,684,115
Additions:
Acquisitions	33,695	11,095,559	5,019,135
Improvements	60,321	114,070	0
Deductions:
Dispositions	(1,261,724)	(1,945,186)	0
Impairments	(106,064)	(105,367)	(3,703)
Reclassification to assets held for sale	(16,761)	(1,116)	0
Other	(631)	0
Balance, end of year	$ 14,566,343	$ 15,857,507	$ 6,699,547