CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Noncontrolling Interests Subject to Put Provisions	Common Stock	Additional Paid-in Capital	Receivable from Noncontrolling Interest Holders	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (loss)	Noncontrolling Interests Not Subject to Put Provisions
Balance at beginning of period at Dec. 31, 2016	$ (31,074)	$ 150,049	$ 184	$ 100,687	$ (544)	$ (131,301)	$ (100)	$ 194,799
Balance at beginning of period (in shares) at Dec. 31, 2016			30,894,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4,597)	17,224				(4,597)		45,509
Stock‑based compensation	15,872			15,872
Exercise of stock option (in shares)			861,866
Exercise of stock options	2,380		$ 9	2,371
Issuance of Restricted Stock (In shares)			277,611
Issuance of restricted stock	0
Cash dividend equivalents accrued on share-based payments	(2,880)			(2,880)
Distributions to noncontrolling interests		(23,656)						(55,822)
Contributions from noncontrolling interests	186	3,015			186			3,321
Purchases of equity of noncontrolling interests	(7,566)	(25,317)		(7,566)				(353)
Redemptions of equity of noncontrolling interests	231	32		231				(282)
Reclassification and other adjustments		(526)						526
Change in fair value of derivative agreements, net of tax	(791)						(791)
Change in fair value of noncontrolling interests	(9,617)	9,617		(9,617)
Balance at end of period at Dec. 31, 2017	(37,856)	130,438	$ 193	99,098	(358)	(135,898)	(891)	187,698
Balance at end of period (in shares) at Dec. 31, 2017			32,034,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(28,767)	13,633				(28,767)		37,601
Reclassification of stranded tax effects related to the Tax Cuts and Jobs Act of 2017						214	(214)
Stock‑based compensation	5,721			5,721
Exercise of stock option (in shares)			348,442
Exercise of stock options	1,398		$ 3	1,395
Issuance of Restricted Stock (In shares)			359,691
Issuance of restricted stock	0
Forfeiture of restricted stock options (In shares)			(70,382)
Forfeiture of restricted stock options	0
Common stock repurchases for tax withholdings of net settlement of equity awards (in shares)			(49,406)
Common stock repurchases for tax withholdings of net settlement of equity awards	(417)			(417)
Vested restricted stock awards withheld on net share settlement (in shares)			(18,938)
Vested restricted stock awards withheld on net share settlement	(421)			(421)
Cash dividend equivalents accrued on share-based payments	478			478
Distributions to noncontrolling interests		(20,243)						(50,717)
Contributions from noncontrolling interests	(148)	2,623			(148)			5,264
Purchases of equity of noncontrolling interests	(6,645)	(1,062)		(6,645)				(1,359)
Redemptions of equity of noncontrolling interests	(891)	166		(891)				1,335
Reclassification and other adjustments	0	10,941						(10,941)
Change in fair value of derivative agreements, net of tax	1,181						1,181
Change in fair value of noncontrolling interests	7,397	(7,397)		7,397
Balance at end of period at Dec. 31, 2018	(58,970)	129,099	$ 196	105,715	(506)	(164,451)	76	168,881
Balance at end of period (in shares) at Dec. 31, 2018			32,603,846
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,790)	9,642				(13,790)		30,293
Stock‑based compensation	$ 4,745			4,745
Exercise of stock option (in shares)	129,917		122,163
Exercise of stock options	$ 10		$ 1	9
Issuance of Restricted Stock (In shares)			324,801
Issuance of restricted stock	0
Forfeiture of restricted stock options (In shares)			(38,940)
Forfeiture of restricted stock options	0
Vested restricted stock awards withheld on net share settlement (in shares)			(35,454)
Vested restricted stock awards withheld on net share settlement	(368)		$ 0	(368)
Cash dividend equivalents accrued on share-based payments	(45)			(45)
Distributions to noncontrolling interests		(15,848)						(47,139)
Contributions from noncontrolling interests	(25)	3,065			(25)			9,964
Purchases of equity of noncontrolling interests	(8,048)	172		(8,048)				(623)
Redemptions of equity of noncontrolling interests	4,735	(570)		4,735				(2,463)
Reclassification and other adjustments		(5,076)						5,076
Change in fair value of derivative agreements, net of tax	(1,695)						(1,695)
Change in fair value of noncontrolling interests	(5,999)	5,999		(5,999)
Balance at end of period at Dec. 31, 2019	$ (79,450)	$ 126,483	$ 197	$ 100,744	$ (531)	$ (178,241)	$ (1,619)	$ 163,989
Balance at end of period (in shares) at Dec. 31, 2019			32,976,416