CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2013	$ 504,897	$ 0	$ 67	$ 461,822	$ (2,722)	$ 45,730
Balance (in shares) at Dec. 31, 2013		0	66,828,670
Increase (Decrease) in Stockholders' Equity
Non-cash, stock-based compensation	9,577			9,577
Shares issued in connection with employee stock programs (in shares)			986,815
Shares issued in connection with employee stock programs	3,836		1	3,835
Tax benefit from employee stock transactions	2,412	0	0	2,412	0	0
Repurchase and retirement of common stock (in shares)		0	(3,314,451)
Repurchase and retirement of common stock	(81,069)	0	(3)	(23,003)	0	(58,063)
Net Income	72,129					72,129
Foreign currency translation	(2,192)				(2,192)
Balance at Jun. 30, 2014	$ 509,590	$ 0	$ 65	$ 454,643	$ (4,914)	$ 59,796
Balance (in shares) at Jun. 30, 2014		0	64,501,034