Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, Net	Retained Earnings	Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2016	$ 456,935	$ 453	$ 311,041	$ (107,135)	$ 252,656	$ (80)
Balance at beginning of period (in shares) at Dec. 31, 2016		45,326,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures	108	$ 4	104
Issuance of common shares for share-based compensation, net of forfeitures (in shares)		370,000
Share-based compensation expense	14,375		14,375
Tax payments related to share-based compensation	(8,580)		(8,580)
Unrealized gain on interest rate swap and foreign currency forward contracts, net of deferred income tax (benefit) expense	16,393			17,029	(636)
Net income (loss) attributable to controlling interests	(145,350)				(145,350)
Net loss attributable to noncontrolling interests	(1)					(1)
Foreign currency translation adjustments, net of deferred income tax (benefit)	56,513			56,511		2
Balance at end of period at Dec. 31, 2017	390,393	$ 457	316,940	(33,595)	106,670	(79)
Balance at beginning of period (in shares) at Dec. 31, 2017		45,696,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures	4	$ 4
Issuance of common shares for share-based compensation, net of forfeitures (in shares)		438,000
Share-based compensation expense	15,660		15,660
Tax payments related to share-based compensation	(5,591)		(5,591)
Unrealized gain on interest rate swap and foreign currency forward contracts, net of deferred income tax (benefit) expense	8,656			8,656
Net income (loss) attributable to controlling interests	3,676				3,676
Net loss attributable to noncontrolling interests	(20)					(20)
Foreign currency translation adjustments, net of deferred income tax (benefit)	(41,936)			(41,938)		2
Balance at end of period at Dec. 31, 2018	$ 376,772	$ 461	327,009	(66,877)	116,276	(97)
Balance at beginning of period (in shares) at Dec. 31, 2018	46,134,381	46,134,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures	$ 3	$ 3
Issuance of common shares for share-based compensation, net of forfeitures (in shares)		274,000
Repurchase of common shares	(50,252)	$ (17)	(11,812)		(38,423)
Repurchase of common shares (in shares)		(1,732,000)
Share-based compensation expense	20,962		20,962
Tax payments related to share-based compensation	(4,050)		(4,050)
Unrealized gain on interest rate swap and foreign currency forward contracts, net of deferred income tax (benefit) expense	(18,546)			(18,547)	1
Net income (loss) attributable to controlling interests	48,274				48,274
Net loss attributable to noncontrolling interests	(9)					(9)
Foreign currency translation adjustments, net of deferred income tax (benefit)	7,172			7,169	3
Balance at end of period at Dec. 31, 2019	$ 380,326	$ 447	$ 332,109	$ (77,887)	$ 125,763	$ (106)
Balance at beginning of period (in shares) at Dec. 31, 2019	44,676,132	44,676,000