Consolidated Statements of Redeemable Noncontrolling Interests and Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Noncontrolling Interests	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Total Stockholders' Equity	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, (in shares)			0	107,350
Beginning Balance at Dec. 31, 2017		$ 123,801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, (in shares)			0	108,681
Beginning balance at Dec. 31, 2017	$ 1,240,516		$ 0	$ 11	$ 682,950	$ (4,113)	$ 202,734	$ 881,582	$ 358,934
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				443
Exercise of stock options	1,908				1,908			1,908
Issuance of restricted stock units, net of tax withholdings (in shares)				888
Issuance of restricted stock units, net of tax withholdings	(2,484)				(2,484)			(2,484)
Stock-based compensation	10,703				10,703			10,703
Contributions from noncontrolling interests and redeemable noncontrolling interests	112,501	31,103							112,501
Distributions to noncontrolling interests and redeemable noncontrolling interests	(14,206)	(2,608)							(14,206)
Net (loss) income	(72,648)	(18,772)					28,032	28,032	(100,680)
Other comprehensive loss, net of taxes	14,938					14,938		14,938
Ending Balance at Mar. 31, 2018		133,524
Ending balance, (in shares) at Mar. 31, 2018			0	108,681
Ending balance at Mar. 31, 2018	1,291,228		$ 0	$ 11	693,077	10,825	230,766	934,679	356,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, (in shares)			0	108,681
Beginning balance, (in shares)			0	113,149
Beginning Balance at Dec. 31, 2018	126,302	126,302
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, (in shares)			0	114,739
Beginning balance at Dec. 31, 2018	$ 1,282,782		$ 0	$ 11	722,429	(3,124)	229,391	948,707	334,075
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	1,139			1,139
Exercise of stock options	$ 4,279				4,279			4,279
Issuance of restricted stock units, net of tax withholdings (in shares)				451
Issuance of restricted stock units, net of tax withholdings	(3,442)				(3,442)			(3,442)
Stock-based compensation	5,783				5,783			5,783
Contributions from noncontrolling interests and redeemable noncontrolling interests	120,539	31,610							120,539
Distributions to noncontrolling interests and redeemable noncontrolling interests	(15,103)	(3,126)							(15,103)
Net (loss) income	(69,736)	(17,170)					(13,862)	(13,862)	(55,874)
Acquisition of noncontrolling interest	(4,989)				1,077			1,077	(6,066)
Other comprehensive loss, net of taxes	(18,002)					(18,002)		(18,002)
Ending Balance at Mar. 31, 2019	137,616	$ 137,616
Ending balance, (in shares) at Mar. 31, 2019			0	114,739
Ending balance at Mar. 31, 2019	$ 1,302,111		$ 0	$ 11	$ 730,126	$ (21,866)	$ 216,269	$ 924,540	$ 377,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, (in shares)			0	114,739