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, 2017	$ 1,567,393	$ 1,284,274	$ 352,906	$ (69,787)
Balance, beginning of period (in shares) at Dec. 31, 2017		147,740
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	42,345		42,345
Reclassification of stranded tax effect to retained earnings	0		1,530	(1,530)
Foreign currency translation adjustments	(4,277)			(4,277)
Unrealized gain on hedges, net of tax	4,774			4,774
Unrealized loss on note receivable, net of tax	(497)			(497)
Accretion of redeemable noncontrolling interests	0
Equity component of debt discount on convertible senior notes	15,411	$ 15,411
Activity in company stock plans, net and other	(438)	$ (438)
Activity in company stock plans, net and other (in shares)		407
Share-based compensation	7,456	$ 7,456
Balance, end of period at Sep. 30, 2018	1,632,168	$ 1,306,703	396,781	(71,316)
Balance, end of period (in shares) at Sep. 30, 2018		148,147
Balance, beginning of period at Jun. 30, 2018	1,602,394	$ 1,303,984	369,659	(71,249)
Balance, beginning of period (in shares) at Jun. 30, 2018		148,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	27,121		27,121
Foreign currency translation adjustments	(1,421)			(1,421)
Unrealized gain on hedges, net of tax	1,354			1,354
Unrealized loss on note receivable, net of tax	0
Accretion of redeemable noncontrolling interests	0
Equity component of debt discount on convertible senior notes	(2)	$ (2)
Activity in company stock plans, net and other	213	$ 213
Activity in company stock plans, net and other (in shares)		40
Share-based compensation	2,509	$ 2,509
Balance, end of period at Sep. 30, 2018	1,632,168	$ 1,306,703	396,781	(71,316)
Balance, end of period (in shares) at Sep. 30, 2018		148,147
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
Unrealized loss on note receivable, net of tax	0
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
Unrealized loss on note receivable, net of tax	0
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