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, 2018			46,134,000
Balance at beginning of period at Dec. 31, 2018	$ 376,772	$ 0	$ 461	$ 327,009	$ (66,877)	$ 366	$ 116,276	$ (366)	$ (97)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			189,000
Issuance of common shares for share-based compensation, net of forfeitures	2		$ 2
Share-based compensation expense	9,734			9,734
Tax payments related to share-based compensation	(2,022)			(2,022)
Repurchase of common shares (in shares)			(678,000)
Repurchase of common shares	(20,100)		$ (7)	(4,590)			(15,503)
Unrealized loss on interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	(26,675)				(26,675)
Net income attributable to controlling interests	14,790						14,790
Net loss attributable to noncontrolling interests	(6)								(6)
Foreign currency translation adjustments, net of deferred income tax benefit	9,378				9,376				2
Balance at end of period (in shares) at Jun. 30, 2019			45,645,000
Balance at end of period at Jun. 30, 2019	361,873		$ 456	330,131	(83,810)		115,197		(101)
Balance at beginning of period (in shares) at Dec. 31, 2018			46,134,000
Balance at beginning of period at Dec. 31, 2018	376,772	0	$ 461	327,009	(66,877)	$ 366	116,276	(366)	(97)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to controlling interests	$ 48,274
Balance at end 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)
Balance at beginning of period (in shares) at Mar. 31, 2019			46,308,000
Balance at beginning of period at Mar. 31, 2019	375,829		$ 463	329,712	(74,478)		120,229		(97)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			15,000
Issuance of common shares for share-based compensation, net of forfeitures	0
Share-based compensation expense	5,250			5,250
Tax payments related to share-based compensation	(241)			(241)
Repurchase of common shares (in shares)			(678,000)
Repurchase of common shares	(20,100)		$ (7)	(4,590)			(15,503)
Unrealized loss on interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	(13,606)				(13,606)
Net income attributable to controlling interests	10,471						10,471
Net loss attributable to noncontrolling interests	(4)								(4)
Foreign currency translation adjustments, net of deferred income tax benefit	4,274				4,274
Balance at end of period (in shares) at Jun. 30, 2019			45,645,000
Balance at end of period at Jun. 30, 2019	$ 361,873		$ 456	330,131	(83,810)		115,197		(101)
Balance at beginning of period (in shares) at Dec. 31, 2019	44,676,132		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)			307,000
Issuance of common shares for share-based compensation, net of forfeitures	293		$ 3	290
Share-based compensation expense	10,222			10,222
Tax payments related to share-based compensation	(5,751)			(5,751)
Repurchase of common shares (in shares)			(506,000)
Repurchase of common shares	(16,873)		$ (5)	(3,530)			(13,338)
Settlement of note hedge and warrants associated with the convertible senior notes	(1,183)			(1,183)
Unrealized loss on interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	(43,082)				(43,082)
Net income attributable to controlling interests	3,833						3,833
Net loss attributable to noncontrolling interests	(5)								(5)
Foreign currency translation adjustments, net of deferred income tax benefit	$ (17,820)				(17,858)		(3)		41
Balance at end of period (in shares) at Jun. 30, 2020	44,476,906		44,477,000
Balance at end of period at Jun. 30, 2020	$ 308,089		$ 445	332,157	(138,827)		114,384		(70)
Balance at beginning of period (in shares) at Mar. 31, 2020			44,456,000
Balance at beginning of period at Mar. 31, 2020	307,859		$ 445	328,528	(137,349)		116,306		(71)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for share-based compensation, net of forfeitures (in shares)			21,000
Issuance of common shares for share-based compensation, net of forfeitures	20		$ 0	20
Share-based compensation expense	5,029			5,029
Tax payments related to share-based compensation	(237)			(237)
Repurchase of common shares	0
Settlement of note hedge and warrants associated with the convertible senior notes	(1,183)			(1,183)
Unrealized loss on interest rate swap and foreign currency forward contracts, net of deferred income tax benefit	(3,240)				(3,240)
Net income attributable to controlling interests	(1,922)						(1,922)
Net loss attributable to noncontrolling interests	1								1
Foreign currency translation adjustments, net of deferred income tax benefit	$ 1,762				1,762		0		0
Balance at end of period (in shares) at Jun. 30, 2020	44,476,906		44,477,000
Balance at end of period at Jun. 30, 2020	$ 308,089		$ 445	$ 332,157	$ (138,827)		$ 114,384		$ (70)