Condensed Consolidated Statement 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, 2018	$ (58,970)	$ 129,099	$ 196	$ 105,715	$ (506)	$ (164,451)	$ 76	$ 168,881
Balance at beginning of period (in shares) at Dec. 31, 2018			32,603,846
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(18,657)	4,000				(18,657)		14,652
Stock-based compensation	2,251			2,251
Exercise of stock options (in shares)			8,807
Exercise of stock options	67			67
Forfeiture of restricted stock awards (in shares)			(20,456)
Vested restricted stock awards withheld on net share settlement (in shares)			(32,154)
Vested restricted stock awards withheld on net share settlement	(338)		$ 1	(339)
Cash dividend equivalents accrued on share-based payments	(27)			(27)
Distributions to noncontrolling interests		(5,631)						(15,998)
Contributions from noncontrolling interests	386	1,343			386			6,861
Purchases of equity of noncontrolling interests	(7,540)	168		(7,540)				(623)
Redemptions of equity of noncontrolling interests	(1,328)			(1,328)				(3,538)
Change in fair value of derivative agreements, net of tax	(1,809)						(1,809)
Change in fair value of noncontrolling interests	4,483	(4,483)		4,483
Balance at end of period at Jun. 30, 2019	(81,482)	124,496	$ 197	103,282	(120)	(183,108)	(1,733)	170,235
Balance at end of period (in shares) at Jun. 30, 2019			32,560,043
Balance at beginning of period at Mar. 31, 2019	(71,576)	129,134	$ 197	104,401	(535)	(174,930)	(709)	173,866
Balance at beginning of period (in shares) at Mar. 31, 2019			32,562,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,178)	3,544				(8,178)		9,774
Stock-based compensation	850			850
Exercise of stock options (in shares)			1,086
Exercise of stock options	(3)			(3)
Forfeiture of restricted stock awards (in shares)			(3,827)
Distributions to noncontrolling interests		(3,480)						(13,399)
Contributions from noncontrolling interests	415	493			415			617
Purchases of equity of noncontrolling interests	(7,590)	441		(7,590)				(623)
Change in fair value of derivative agreements, net of tax	(1,024)						(1,024)
Change in fair value of noncontrolling interests	5,636	(5,636)		5,636
Balance at end of period at Jun. 30, 2019	(81,482)	124,496	$ 197	103,282	(120)	(183,108)	(1,733)	170,235
Balance at end of period (in shares) at Jun. 30, 2019			32,560,043
Balance at beginning of period at Dec. 31, 2019	(79,450)	126,483	$ 197	100,744	(531)	(178,241)	(1,619)	163,988
Balance at beginning of period (in shares) at Dec. 31, 2019			32,976,416
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,439)	5,419				(6,439)		13,526
Stock-based compensation	4,240			4,240
Exercise of stock options (in shares)			900,180
Exercise of stock options	$ 872		$ 8	864
Issuance of restricted stock (in shares)	843,015
Forfeiture of restricted stock awards (in shares)			(176,503)
Vested restricted stock awards withheld on net share settlement (in shares)			(54,543)
Vested restricted stock awards withheld on net share settlement	$ (428)		$ 3	(431)
Cash dividend equivalents accrued on share-based payments	(7)			(7)
Distributions to noncontrolling interests		(6,964)						(15,997)
Contributions from noncontrolling interests	(1,770)	1,509			(1,770)			2,284
Purchases of equity of noncontrolling interests	(886)	177		(886)
Redemptions of equity of noncontrolling interests	3,448			3,448				(7,519)
Reclassification/other adjustments	4,181	(16,488)		4,181				71
Change in fair value of derivative agreements, net of tax	(770)						(770)
Change in fair value of noncontrolling interests	(269)	269		(269)
Balance at end of period at Jun. 30, 2020	(77,278)	110,405	$ 208	111,884	(2,301)	(184,680)	(2,389)	156,353
Balance at end of period (in shares) at Jun. 30, 2020			34,488,565
Balance at beginning of period at Mar. 31, 2020	(86,591)	127,737	$ 199	102,789	(1,568)	(185,475)	(2,536)	160,341
Balance at beginning of period (in shares) at Mar. 31, 2020			33,736,896
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	795	4,038				795		10,001
Stock-based compensation	1,517			1,517
Exercise of stock options (in shares)			855,955
Exercise of stock options	718		$ 8	710
Issuance of restricted stock (in shares)			18,679
Forfeiture of restricted stock awards (in shares)			(122,849)
Vested restricted stock awards withheld on net share settlement (in shares)			(116)
Vested restricted stock awards withheld on net share settlement	(1)		$ 1	(2)
Distributions to noncontrolling interests		(3,844)						(8,370)
Contributions from noncontrolling interests	(733)	203			(733)			1,017
Purchases of equity of noncontrolling interests	(886)	177		(886)
Redemptions of equity of noncontrolling interests								(4,550)
Reclassification/other adjustments	4,181	(14,331)		4,181				(2,086)
Change in fair value of derivative agreements, net of tax	147						147
Change in fair value of noncontrolling interests	3,575	(3,575)		3,575
Balance at end of period at Jun. 30, 2020	$ (77,278)	$ 110,405	$ 208	$ 111,884	$ (2,301)	$ (184,680)	$ (2,389)	$ 156,353
Balance at end of period (in shares) at Jun. 30, 2020			34,488,565