UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at Dec. 31, 2013	$ 1,475,639	$ 607	$ (469)	$ 898,165	$ (19,556)	$ 596,892
Balance (in shares) at Dec. 31, 2013		60,672,000
Increase (Decrease) in Stockholders' Equity
Net income	37,632					37,632
Other comprehensive loss	(5,469)				(5,469)
Stock-based compensation	4,340			4,340
Issuance of restricted shares, net of shares remitted	(2,215)	1		(2,216)
Issuance of restricted shares, net of shares remitted (in shares)		89,000
Repurchases of common stock	(16,219)	(3)		(16,216)
Repurchases of common stock (in shares)		(273,000)
Net tax benefit on exercise of stock-based awards	644			644
Employee stock purchase plan	4,364	1		4,363
Employee stock purchase plan (in shares)		91,000
Balance at Jun. 30, 2014	$ 1,498,716	$ 606	$ (469)	$ 889,080	$ (25,025)	$ 634,524
Balance (in shares) at Jun. 30, 2014		60,579,000