Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance (in shares) at Dec. 31, 2013		25,457
Balance at Dec. 31, 2013	$ 575,907	$ 255	$ 171,819	$ 394,628	$ 5,195	$ 4,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102,791			103,726		(935)
Other comprehensive (loss) gain, net of tax	(6,103)				(6,117)	14
Initial noncontrolling interest related to business combinations	892					892
Change in fair value of redeemable noncontrolling interest	(5,730)		(5,730)
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes (in shares)		737
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes	(15,489)	$ 7	(15,496)
Repurchase of common stock (in shares)		(400)
Repurchase of common stock	(16,815)	$ (4)	(16,811)
Stock-based compensation	17,181		17,181
Tax benefit related to stock-based compensation	11,580		11,580
Issuance of convertible notes, net of hedge transactions	(28,160)		(28,160)
Reclassification of redeemable equity component of convertible senior notes	(9,073)		(9,073)
Balance (in shares) at Dec. 31, 2014		25,794
Balance at Dec. 31, 2014	626,981	$ 258	125,310	498,354	(922)	3,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	46,013			45,135		878
Other comprehensive (loss) gain, net of tax	(56,900)				(56,900)	0
Initial noncontrolling interest related to business combinations	2,426					2,426
Change in fair value of redeemable noncontrolling interest	(2,349)		(2,349)
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes (in shares)		333
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes	(5,318)	$ 3	(5,321)
Repurchase of common stock (in shares)		(839)
Repurchase of common stock	(33,185)	$ (8)	(33,177)
Stock-based compensation	22,008		22,008
Tax benefit related to stock-based compensation	1,251		1,251
Reclassification of redeemable equity component of convertible senior notes	2,948		2,948
Other	(137)		(137)
Balance (in shares) at Dec. 31, 2015		25,288
Balance at Dec. 31, 2015	603,738	$ 253	110,533	543,489	(57,822)	7,285
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64,648			76,570		(11,922)
Other comprehensive (loss) gain, net of tax	(50,766)				(47,089)	(3,677)
Initial noncontrolling interest related to business combinations	775					775
Change in fair value of redeemable noncontrolling interest	(74,194)		(14,702)	(59,492)
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes (in shares)		305
Exercise of stock options and issuance of share-based awards, net of shares withheld for employee taxes	(4,478)	$ 3	(4,481)
Stock-based compensation	12,627		12,627
Tax benefit related to stock-based compensation	(2,324)		(2,324)
Reclassification of redeemable equity component of convertible senior notes	3,130		3,130
Other	(1,391)		(1,391)
Balance (in shares) at Dec. 31, 2016		25,593
Balance at Dec. 31, 2016	$ 551,765	$ 256	$ 103,392	$ 560,567	$ (104,911)	$ (7,539)