Condensed Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Cumulative-effect adjustments upon adoption of ASU	Common Stock	Retained Earnings Cumulative-effect adjustments upon adoption of ASU	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Cumulative-effect adjustments upon adoption of ASU	Total
Balance, beginning of period (Accounting Standards Update 2016-13) at Dec. 31, 2019			$ (620)			$ (620)
Balance, beginning of period at Dec. 31, 2019		$ 1,318,961		$ 445,370	$ (64,740)		$ 1,699,591
Balance, beginning of period (in shares) at Dec. 31, 2019		148,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(6,488)			(6,488)
Foreign currency translation adjustments					(35,483)		(35,483)
Unrealized gain on hedges, net of tax					285		285
Accretion of redeemable noncontrolling interests				(2,155)			(2,155)
Activity in company stock plans, net and other		$ (4,513)					(4,513)
Activity in company stock plans, net and other (in shares)		1,152
Share-based compensation		$ 4,083					4,083
Balance, end of period at Jun. 30, 2020		$ 1,318,531		436,107	(99,938)		1,654,700
Balance, end of period (in shares) at Jun. 30, 2020		150,040
Balance, beginning of period at Dec. 31, 2019							3,455
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)							(1,990)
Foreign currency translation adjustments related to redeemable noncontrolling interests							(248)
Accretion of redeemable noncontrolling interests							2,155
Balance, end of period at Jun. 30, 2020							3,372
Balance, beginning of period at Mar. 31, 2020		$ 1,316,401		430,726	(98,062)		1,649,065
Balance, beginning of period (in shares) at Mar. 31, 2020		149,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				5,450			5,450
Foreign currency translation adjustments					(1,896)		(1,896)
Unrealized gain on hedges, net of tax					20		20
Accretion of redeemable noncontrolling interests				(69)			(69)
Activity in company stock plans, net and other		$ 217					217
Activity in company stock plans, net and other (in shares)		78
Share-based compensation		$ 1,913					1,913
Balance, end of period at Jun. 30, 2020		$ 1,318,531		436,107	(99,938)		1,654,700
Balance, end of period (in shares) at Jun. 30, 2020		150,040
Balance, beginning of period at Mar. 31, 2020							3,323
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Foreign currency translation adjustments related to redeemable noncontrolling interests							(20)
Accretion of redeemable noncontrolling interests							69
Balance, end of period at Jun. 30, 2020							3,372
Balance, beginning of period (Accounting Standards Update 2020-06) at Dec. 31, 2020	$ (41,456)		$ 6,682			$ (34,774)
Balance, beginning of period at Dec. 31, 2020		$ 1,327,592		464,524	(51,620)		1,740,496
Balance, beginning of period (in shares) at Dec. 31, 2020		150,341
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(16,587)			(16,587)
Foreign currency translation adjustments					6,969		6,969
Accretion of redeemable noncontrolling interests							(241)
Accretion of redeemable noncontrolling interests				1,489			1,489
Activity in company stock plans, net and other		$ (1,314)					(1,314)
Activity in company stock plans, net and other (in shares)		446
Share-based compensation		$ 3,781					3,781
Balance, end of period at Jun. 30, 2021		$ 1,288,603		456,108	(44,651)		1,700,060
Balance, end of period (in shares) at Jun. 30, 2021		150,787
Balance, beginning of period at Dec. 31, 2020							3,855
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)							(146)
Foreign currency translation adjustments related to redeemable noncontrolling interests							48
Accretion of redeemable noncontrolling interests							(1,489)
Acquisition of redeemable noncontrolling interests							(2,268)
Balance, beginning of period at Mar. 31, 2021		$ 1,286,380		468,087	(47,007)		1,707,460
Balance, beginning of period (in shares) at Mar. 31, 2021		150,715
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(13,709)			(13,709)
Foreign currency translation adjustments					2,356		2,356
Accretion of redeemable noncontrolling interests				1,730			1,730
Activity in company stock plans, net and other		$ 286					286
Activity in company stock plans, net and other (in shares)		72
Share-based compensation		$ 1,937					1,937
Balance, end of period at Jun. 30, 2021		$ 1,288,603		$ 456,108	$ (44,651)		1,700,060
Balance, end of period (in shares) at Jun. 30, 2021		150,787
Balance, beginning of period at Mar. 31, 2021							3,960
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)							26
Foreign currency translation adjustments related to redeemable noncontrolling interests							12
Accretion of redeemable noncontrolling interests							(1,730)
Acquisition of redeemable noncontrolling interests							$ (2,268)