Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)	$ 2,620,116	[1]	$ 206,145	[1]	$ (210,388)
Other comprehensive income, net of tax:
Change in fair value of derivatives	197		314		213
Other comprehensive income	197		314		213
Comprehensive income (loss)	$ 2,620,313		$ 206,459		$ (210,175)

[1] Due to rounding, the sum of quarterly results may not equal the total for the year. Additionally, quarterly and year-to-date computations of per share amounts are made independently.