Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 3,887	$ (17,326)	$ (17,326)
Change in fair value of derivative instruments,accounted for as hedges, net of income tax (expense) benefit of $309 and ($452), respectively	(3,910)	764	764
Comprehensive income (loss)	$ (23)		$ (16,562)