Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative effect of change in accounting principle	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, Net	Accumulated Other Comprehensive Loss, Net Cumulative effect of change in accounting principle	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle	Noncontrolling Interests
Balance at beginning of period (in shares) at Dec. 31, 2017			45,696,000
Balance at beginning of period at Dec. 31, 2017	$ 390,393	$ 5,930	$ 457	$ 316,940	$ (33,595)		$ 106,670	$ 5,930	$ (79)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			438,000
Issuance of common shares for share-based compensation, net of forfeitures	4		$ 4
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 beginning of period (in shares) at Dec. 31, 2018			46,134,000
Balance at end of period at Dec. 31, 2018	$ 376,772	0	$ 461	327,009	(66,877)	$ 368	116,276	(368)	(97)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			274,000
Issuance of common shares for share-based compensation, net of forfeitures	$ 3		$ 3
Share-based compensation expense	20,962			20,962
Tax payments related to share-based compensation	(4,050)			(4,050)
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
Repurchase of common shares (in shares)			(1,732,000)
Repurchase of common shares	(50,252)		$ (17)	(11,812)			(38,423)
Unrealized gain (loss) on interest rate swap, cap contracts, and foreign currency forward contracts	$ (18,546)				(18,547)		1
Balance at beginning of period (in shares) at Dec. 31, 2019	44,676,132		44,676,000
Balance at end of period at Dec. 31, 2019	$ 380,326	$ (1,871)	$ 447	332,109	(77,887)		125,763	$ (1,871)	(106)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			369,000
Issuance of common shares for share-based compensation, net of forfeitures	296		$ 3	293
Share-based compensation expense	22,264			22,264
Tax payments related to share-based compensation	(6,897)			(6,897)
Net income (loss) attributable to controlling interests	19,144						19,144
Net loss attributable to noncontrolling interests	(7)								(7)
Foreign currency translation adjustments, net of deferred income tax (benefit)	17,646				17,571		(5)		80
Repurchase of common shares (in shares)			(506,000)
Repurchase of common shares	(16,873)		$ (5)	(3,530)			(13,338)
Unrealized gain (loss) on interest rate swap, cap contracts, and foreign currency forward contracts	(33,415)				(33,415)
Settlement of note hedge and warrants associated with the convertible senior notes	$ (1,197)			(1,197)
Balance at beginning of period (in shares) at Dec. 31, 2020	44,539,433		44,539,000
Balance at end of period at Dec. 31, 2020	$ 379,416		$ 445	$ 343,042	$ (93,731)		$ 129,693		$ (33)