Schedule III - Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 1,331,751	$ 775,050	$ 205,712
Additions:
Depreciation expense	586,321	630,347	628,340
Deductions:
Dispositions	(77,987)	(49,907)	(49,377)
Impairments	(69,040)	(23,196)	(9,625)
Reclassified to assets held for sale	(5,039)	(543)	0
Balance, end of year	$ 1,766,006	$ 1,331,751	$ 775,050