CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 70,690		$ (38,336)		$ 163,939		$ 12,889
Reclassification to earnings	308	[1]	(315)	[1]	1,115	[1]	(1,465)	[1]
Pension liability adjustment	0		1		(3)		1
Total other comprehensive income (loss), net of tax	308		(314)		1,112		(1,464)
Total comprehensive income (loss)	$ 70,998		$ (38,650)		$ 165,051		$ 11,425

[1] Reclassification from accumulated other comprehensive income related to de-designated hedges. Refer to Note 10 - Derivative Financial Instruments for further information.