Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (50,623)	$ 5,958	$ (231,379)	$ 28,160
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of ($6), $520, ($1,105), and $520, respectively	(10)	4,533	(1,866)	1,975
Comprehensive income (loss)	$ (50,633)	$ 10,491	$ (233,245)	$ 30,135