UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at beginning of period at Dec. 31, 2013	$ 1,475,639	$ 607	$ (469)	$ 898,165	$ (19,556)	$ 596,892
Balance beginning of period (in shares) at Dec. 31, 2013		60,672
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(55,705)					(55,705)
Other comprehensive loss	(54,561)				(54,561)
Stock-based compensation	6,446			6,446
Issuance of restricted shares, net of shares remitted	(2,668)	1		(2,669)
Issuance of restricted shares, net of shares remitted		108
Repurchases of common stock	(53,793)	(9)		(53,784)
Repurchases of common stock		(923)
Net tax benefit on exercise of stock-based awards	829			829
Employee stock purchase plan	4,364	1		4,363
Employee stock purchase plan		91
Balance at end of period at Sep. 30, 2014	$ 1,320,551	$ 600	$ (469)	$ 853,350	$ (74,117)	$ 541,187
Balance ending of period (in shares) at Sep. 30, 2014		59,948