CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2010	$ 1,312,994	$ 47,090	$ 985,413	$ 316,531	$ (36,040)
Net income (loss)	86,148			86,148
Other comprehensive income (loss)	(7,575)				(7,575)
TOTAL COMPREHENSIVE INCOME (LOSS)	78,573
Tax effect of stock-based compensation	(367)		(367)
Stock-based compensation expense	8,818		8,818
Issuance of common stock, net	(191)	239	(430)
Balance at Dec. 31, 2011	1,399,827	47,329	993,434	402,679	(43,615)
Net income (loss)	(265,400)			(265,400)
Other comprehensive income (loss)	41				41
TOTAL COMPREHENSIVE INCOME (LOSS)	(265,359)
Tax effect of stock-based compensation	(195)		(195)
Stock-based compensation expense	9,470		9,470
Issuance of common stock, net	121	227	(106)
Balance at Dec. 31, 2012	1,143,864	47,556	1,002,603	137,279	(43,574)
Net income (loss)	87,296			87,296
Other comprehensive income (loss)	10,195				10,195
TOTAL COMPREHENSIVE INCOME (LOSS)	97,491
Tax effect of stock-based compensation	(7)		(7)
Stock-based compensation expense	6,623		6,623
Issuance of common stock, net	(436)	865	(1,301)
Balance at Dec. 31, 2013	$ 1,247,535	$ 48,421	$ 1,007,918	$ 224,575	$ (33,379)