Consolidated statements of comprehensive (loss) income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Comprehensive income
Net income (loss)	$ 4,405	$ (1,190)
Other comprehensive loss
Reclassification adjustment for hedge gains included in gain from oil hedging activities in the consolidated statements of operations	0	(10,003)
Income tax benefit related to other comprehensive loss	0	3,818
Other comprehensive loss, net of tax	0	(6,185)
Comprehensive income (loss)	$ 4,405	$ (7,375)