Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)
Beginning Balance (in shares) at Dec. 31, 2014	41,181	41,181
Beginning Balance at Dec. 31, 2014	$ 1,102,746	$ 412	$ 393,174	$ 789,428	$ (80,268)
Net income	55,704			55,704
Other comprehensive income (loss):
Cumulative translation adjustment	(24,412)				(24,412)
Issuance of common stock in connection with:
Exercise of options, net of income tax benefit from share-based awards of $1,791 (in shares)		627
Exercise of options, net of income tax benefit from share-based awards of $1,791	16,385	$ 6	16,379
Restricted share grants, less net settled shares of 111 (in shares)		79
Restricted share grants, less net settled shares of 111	(4,166)	$ 1	(4,167)
Stock units issued under incentive compensation plan	2,124		2,124
Share-based compensation	$ 14,022		14,022
Ending Balance (in shares) at Sep. 30, 2015	41,887	41,887
Ending Balance at Sep. 30, 2015	$ 1,162,403	$ 419	$ 421,532	$ 845,132	$ (104,680)