Consolidated Statements Of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net (loss) income	$ 39,570	$ 66,201	$ 96,767	$ 134,293
Other comprehensive income, before tax:
Gains on hedging instrument	0	0	0	0
Other comprehensive income, before tax:	0	0	0	0
Income tax expense related to gains on hedging instrument	0	0	0	0
Other comprehensive income, net of tax:	0	0	0	0
Comprehensive (loss) income	$ 39,570	$ 66,201	$ 96,767	$ 134,293