Condensed Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2018	$ 1,617,779	$ 1,308,709	$ 383,034	$ (73,964)
Balance, beginning of period (in shares) at Dec. 31, 2018		148,203
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	49,867		49,867
Reclassification of deferred gain from sale and leaseback transaction to retained earnings	4,560		4,560
Foreign currency translation adjustments	(4,564)			(4,564)
Unrealized gain on hedges, net of tax	3,328			3,328
Accretion of redeemable noncontrolling interests	(43)		(43)
Activity in company stock plans, net and other	(765)	$ (765)
Activity in company stock plans, net and other (in shares)		599
Share-based compensation	8,861	$ 8,861
Balance, end of period at Sep. 30, 2019	1,679,023	$ 1,316,805	437,418	(75,200)
Balance, end of period (in shares) at Sep. 30, 2019		148,802
Balance, beginning of period at Jun. 30, 2019	1,648,396	$ 1,314,163	405,748	(71,515)
Balance, beginning of period (in shares) at Jun. 30, 2019		148,759
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	31,695		31,695
Foreign currency translation adjustments	(4,301)			(4,301)
Unrealized gain on hedges, net of tax	616			616
Accretion of redeemable noncontrolling interests	(25)		(25)
Activity in company stock plans, net and other	214	$ 214
Activity in company stock plans, net and other (in shares)		43
Share-based compensation	2,428	$ 2,428
Balance, end of period at Sep. 30, 2019	1,679,023	$ 1,316,805	437,418	(75,200)
Balance, end of period (in shares) at Sep. 30, 2019		148,802
Balance, beginning of period at Dec. 31, 2019	1,699,591	$ 1,318,961	445,370	(64,740)
Balance, beginning of period (in shares) at Dec. 31, 2019		148,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	18,011		18,011
Expected credit losses recognized in retained earnings upon adoption of ASU 2016-13	(620)		(620)
Foreign currency translation adjustments	(16,057)			(16,057)
Unrealized gain on hedges, net of tax	285			285
Accretion of redeemable noncontrolling interests	(2,283)		(2,283)
Equity component of convertible senior notes	33,336	$ 33,336
Re-acquisition of equity component of convertible senior notes	(18,006)	(18,006)
Capped call transactions	(10,625)	(10,625)
Activity in company stock plans, net and other	(4,320)	$ (4,320)
Activity in company stock plans, net and other (in shares)		1,248
Share-based compensation	6,174	$ 6,174
Balance, end of period at Sep. 30, 2020	1,705,486	$ 1,325,520	460,478	(80,512)
Balance, end of period (in shares) at Sep. 30, 2020		150,136
Balance, beginning of period at Jun. 30, 2020	1,654,700	$ 1,318,531	436,107	(99,938)
Balance, beginning of period (in shares) at Jun. 30, 2020		150,040
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	24,499		24,499
Foreign currency translation adjustments	19,426			19,426
Unrealized gain on hedges, net of tax	0
Accretion of redeemable noncontrolling interests	(128)		(128)
Equity component of convertible senior notes	33,336	$ 33,336
Re-acquisition of equity component of convertible senior notes	(18,006)	(18,006)
Capped call transactions	(10,625)	(10,625)
Activity in company stock plans, net and other	193	$ 193
Activity in company stock plans, net and other (in shares)		96
Share-based compensation	2,091	$ 2,091
Balance, end of period at Sep. 30, 2020	$ 1,705,486	$ 1,325,520	$ 460,478	$ (80,512)
Balance, end of period (in shares) at Sep. 30, 2020		150,136