Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net (loss) income attributable to the Company	$ (14,303)	$ (10,019)	$ (5,160)	$ (5,232)	$ 95,327	$ (4,467)	$ (9,783)	$ (7,842)	$ (34,714)	$ 73,235	$ (33,266)
Adjustments to net (loss) income attributable to the Company									221	(750)	(505)
Net (loss) income attributable to common shareholders									(34,493)	72,485	(33,771)
Net income (loss) allocable to participating securities									0	(506)	0
Allocation of net (loss) income among common shareholders									(34,493)	71,979	(33,771)
Reallocation of (loss) income to Company upon assumed exchange of common units									0	(48,289)	0
Net (loss) income allocated to participating securities									0	(69)	0
Allocation of net (loss) income among common shareholders									$ (34,493)	$ 24,127	$ (33,771)
Restricted Stock Units (RSUs)
Denominator:
Anti-dilutive potential securities (in shares)									72,579	0	1,304,804
Restricted Stock
Denominator:
Anti-dilutive potential securities (in shares)									1,817,020	0	0
Common Class A
Denominator:
Anti-dilutive potential securities (in shares)									79,883,687	0	53,826,230
Class A Units
Denominator:
Basic (in dollars per share)										$ 1.33	$ (0.89)
Diluted (in dollars per share)										$ 0.18	$ (0.89)
Common Class A
Numerator:
Net (loss) income attributable to common shareholders									$ (34,480)	$ 71,947	$ (33,755)
Numerator for diluted net (loss) income available to Class B Common Shareholders									$ (34,480)	$ 24,123	$ (33,755)
Denominator:
Basic (in shares)									65,002,387	54,006,954	37,795,447
Diluted (in shares)									65,002,387	133,007,828	37,795,447
Basic (in dollars per share)	$ (0.22)	$ (0.15)	$ (0.08)	$ (0.08)	$ 1.50	$ (0.07)	$ (0.19)	$ (0.20)	$ (0.53)	$ 1.33	$ (0.89)
Diluted (in dollars per share)	$ (0.22)	$ (0.15)	$ (0.08)	$ (0.10)	$ 0.56	$ (0.07)	$ (0.19)	$ (0.20)	$ (0.53)	$ 0.18	$ (0.89)
Common Class B
Numerator:
Net (loss) income attributable to common shareholders									$ (13)	$ 32	$ (16)
Numerator for diluted net (loss) income available to Class B Common Shareholders									$ (13)	$ 4	$ (16)
Denominator:
Basic and diluted (in shares)									79,859,730	78,821,553	49,547,050
Basic (in dollars per share)									$ 0.00	$ 0.00	$ 0.00
Diluted (in dollars per share)									$ 0.00	$ 0.00	$ 0.00