Earnings per Share - Basic Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Income (numerator):
Net income (loss) attributable to controlling interests		$ (64,806)	$ (82,216)	$ (9,853)	$ (83,603)	$ (148,409)	$ (14,187)
Less: Dividends and accretion on preferred stock		(1,966)		(765)		(5,959)	(765)
Net income (loss) attributable to common shareholders		$ (66,772)	$ (84,182)	$ (10,618)	$ (87,596)	$ (154,368)	$ (14,952)
Weighted-average shares (denominator):
Weighted-average number of shares of Class A common stock - basic (in shares)	[1]	73,089	65,681	44,993	63,948	67,029	37,299
Weighted-average number of shares of Class A common stock - diluted (in shares)	[1]	73,089	65,681	44,993	63,948	67,029	37,299
Earnings (loss) per share:
Basic - Net income (loss) attributable to common shareholders (in dollars per share)	[1]	$ (0.91)	$ (1.28)	$ (0.24)	$ (1.37)	$ (2.30)	$ (0.40)
Diluted - Net income (loss) attributable to common shareholders (in dollars per share)	[1]	$ (0.91)	$ (1.28)	$ (0.24)	$ (1.37)	$ (2.30)	$ (0.40)

[1] All share and earnings per share information presented has been recast to retrospectively adjust for the effects of the 0.087423 per share Special Stock Dividend, as defined in Note 12, “Stockholders’ and Mezzanine equity”, distributed on March 31, 2017.