Income Taxes - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
(Income) loss attributable to common stockholders	$ (127,680)	$ 33,545	$ 80,895
Loss attributable to noncontrolling interest and redeemable noncontrolling interests	394,988	220,660	86,638
Loss before income taxes	$ 267,308	$ 254,205	$ 167,533