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	15,224		15,224
Reclassification of stranded tax effect to retained earnings	0		1,530	(1,530)
Foreign currency translation adjustments	(2,856)			(2,856)
Unrealized gain on hedges, net of tax	3,420			3,420
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	15,413	$ 15,413
Activity in company stock plans, net and other	(651)	$ (651)
Activity in company stock plans, net and other (in shares)		367
Share-based compensation	4,947	$ 4,947
Balance, end of period at Jun. 30, 2018	1,602,394	$ 1,303,984	369,659	(71,249)
Balance, end of period (in shares) at Jun. 30, 2018		148,107
Balance, beginning of period at Mar. 31, 2018	1,589,018	$ 1,301,299	351,876	(64,157)
Balance, beginning of period (in shares) at Mar. 31, 2018		148,080
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	17,784		17,784
Foreign currency translation adjustments	(7,547)			(7,547)
Unrealized gain on hedges, net of tax	455			455
Unrealized loss on note receivable, net of tax	0
Accretion of redeemable noncontrolling interests	0
Equity component of debt discount on convertible senior notes	(11)	$ (11)
Activity in company stock plans, net and other	211	$ 211
Activity in company stock plans, net and other (in shares)		27
Share-based compensation	2,484	$ 2,484
Balance, end of period at Jun. 30, 2018	1,602,394	$ 1,303,984	369,659	(71,249)
Balance, end of period (in shares) at Jun. 30, 2018		148,107
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	18,172		18,172
Reclassification of deferred gain from sale and leaseback transaction to retained earnings	4,560		4,560
Foreign currency translation adjustments	(263)			(263)
Unrealized gain on hedges, net of tax	2,712			2,712
Unrealized loss on note receivable, net of tax	0
Accretion of redeemable noncontrolling interests	(18)		(18)
Activity in company stock plans, net and other	(979)	$ (979)
Activity in company stock plans, net and other (in shares)		556
Share-based compensation	6,433	$ 6,433
Balance, end of period at Jun. 30, 2019	1,648,396	$ 1,314,163	405,748	(71,515)
Balance, end of period (in shares) at Jun. 30, 2019		148,759
Balance, beginning of period at Mar. 31, 2019	1,629,843	$ 1,310,738	388,912	(69,807)
Balance, beginning of period (in shares) at Mar. 31, 2019		148,785
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders	16,854		16,854
Foreign currency translation adjustments	(3,065)			(3,065)
Unrealized gain on hedges, net of tax	1,357			1,357
Unrealized loss on note receivable, net of tax	0
Accretion of redeemable noncontrolling interests	(18)		(18)
Activity in company stock plans, net and other	(320)	$ (320)
Activity in company stock plans, net and other (in shares)		(26)
Share-based compensation	3,745	$ 3,745
Balance, end of period at Jun. 30, 2019	$ 1,648,396	$ 1,314,163	$ 405,748	$ (71,515)
Balance, end of period (in shares) at Jun. 30, 2019		148,759