Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2016	$ 1,207,358	$ 420	$ 416,816	$ 941,001	$ (150,879)
Beginning Balance (in shares) at Dec. 31, 2016	42,037	42,037
Net income	$ 8,860			8,860
Other comprehensive income (loss):
Cumulative translation adjustment	17,544				17,544
Issuance of common stock in connection with:
Exercise of options (in shares)		55
Exercise of options	1,910	$ 1	1,909
Restricted share grants, less net settled shares of 56 (in shares)		202
Restricted share grants, less net settled shares of 56	(2,298)	$ 2	(2,300)
Stock units issued under incentive compensation plan	1,547		1,547
Purchase and retirement of common stock (in shares)		(2,767)
Purchase and retirement of common stock	(102,513)	$ (28)	(102,485)
Cumulative effect due to adoption of new accounting standard	(3,189)			(3,189)
Share-based compensation	9,959		9,959
Ending Balance at Jun. 30, 2017	$ 1,139,178	$ 395	$ 325,446	$ 946,672	$ (133,335)
Ending Balance (in shares) at Jun. 30, 2017	39,527	39,527