CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 65,607		$ 16,727
Reclassification to earnings	0	[1]	61	[1]
Pension liability adjustment	0		(3)
Total other comprehensive income, net of tax	0		58
Total comprehensive income	$ 65,607		$ 16,785

[1] Reclassification from accumulated other comprehensive income (loss) (“AOCIL”) related to de-designated hedges. As of December 31, 2013, all commodity derivative contracts that had been designated as cash flow hedges were settled and reclassified into earnings from AOCIL.