CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive loss	Accumulated Earnings
Beginning balance at Dec. 31, 2013	$ 1,475,639	$ 607	$ (469)	$ 898,165	$ (19,556)	$ 596,892
Beginning balance (in shares) at Dec. 31, 2013		60,672
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(28,328)					(28,328)
Other comprehensive loss	(91,286)				(91,286)
Stock-based compensation	8,800			8,800
Stock-based compensation (in shares)		0
Issuance of restricted shares, net of shares remitted	(2,793)	$ 1		(2,794)
Issuance of restricted shares, net of shares remitted (in shares)		113
Repurchases of common stock	(104,341)	$ (20)		(104,321)
Repurchases of common stock (in shares)		(1,973)
Net tax benefit on stock-based awards	816			816
Employee stock purchase plan	4,364	$ 1		4,363
Employee stock purchase plan (in shares)		91
Ending balance at Dec. 31, 2014	1,262,871	$ 589	(469)	805,029	(110,842)	568,564
Ending balance (in shares) at Dec. 31, 2014		58,903
Increase (Decrease) in Stockholders' Equity
Net (loss) income	44,102					44,102
Other comprehensive loss	(144,050)				(144,050)
Stock-based compensation	8,550			8,550
Issuance of restricted shares, net of shares remitted	(2,159)	$ 1		(2,160)
Issuance of restricted shares, net of shares remitted (in shares)		100
Exercise of stock options	397			397
Exercise of stock options (in shares)		12
Repurchases of common stock	(73,347)	$ (14)		(73,333)
Repurchases of common stock (in shares)		(1,422)
Net tax benefit on stock-based awards	(82)			(82)
Ending balance at Dec. 31, 2015	1,096,282	$ 576	(469)	738,401	(254,892)	612,666
Ending balance (in shares) at Dec. 31, 2015		57,593
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(39,873)					(39,873)
Other comprehensive loss	40,566				40,566
Stock-based compensation	10,481			10,481
Issuance of restricted shares, net of shares remitted	(2,819)	$ 1		(2,820)
Issuance of restricted shares, net of shares remitted (in shares)		136
Exercise of stock options	627			627
Exercise of stock options (in shares)		22
Repurchases of common stock	(22,188)	$ (4)		(22,184)
Repurchases of common stock (in shares)		(453)
Net tax benefit on stock-based awards	1,165			1,165
Ending balance at Dec. 31, 2016	$ 1,084,241	$ 573	$ (469)	$ 725,670	$ (214,326)	$ 572,793
Ending balance (in shares) at Dec. 31, 2016		57,298