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	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle	Noncontrolling Interests
Balance at beginning of period (in shares) at Dec. 31, 2019			44,676,000
Balance at beginning 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)			286,000
Issuance of common shares for share-based compensation, net of forfeitures	274		$ 3	271
Share-based compensation expense	5,193			5,193
Tax payments related to share-based compensation	(5,515)			(5,515)
Unrealized loss on interest rate derivatives, interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	(39,842)				(39,842)
Net income attributable to controlling interests	5,755					5,755
Net loss attributable to noncontrolling interests	(6)							(6)
Foreign currency translation adjustments, net of deferred income tax benefit	(19,582)				(19,620)	(3)		41
Repurchase of common shares (in shares)			(506,000)
Repurchase of common shares	(16,873)		$ (5)	(3,530)		(13,338)
Balance at end of period (in shares) at Mar. 31, 2020			44,456,000
Balance at end of period at Mar. 31, 2020	307,859		$ 445	328,528	(137,349)	116,306		(71)
Balance at beginning of period (in shares) at Dec. 31, 2019			44,676,000
Balance at beginning 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]
Net income attributable to controlling interests	$ 19,144
Balance at end 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			717,000
Issuance of common shares for share-based compensation, net of forfeitures	768		$ 8	760
Share-based compensation expense	4,258			4,258
Tax payments related to share-based compensation	(14,464)			(14,464)
Unrealized loss on interest rate derivatives, interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	15,064				15,064
Net income attributable to controlling interests	5,876					5,876
Net loss attributable to noncontrolling interests	(3)							(3)
Foreign currency translation adjustments, net of deferred income tax benefit	$ 2,541				2,605	(1)		(63)
Balance at end of period (in shares) at Mar. 31, 2021	45,255,680		45,256,000
Balance at end of period at Mar. 31, 2021	$ 393,456		$ 453	$ 333,596	$ (76,062)	$ 135,568		$ (99)