Income Taxes (Tables)

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Schedule of provision for income taxes

The provision for income taxes consists of the following:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2013			2012			2013			2012
	(in thousands)
Current portion of income tax expense (benefit):
Federal	$	—		$	—		$	—		$	—
State	(46		)	174			302			435
Deferred portion of income tax expense (benefit)	42,380			(22,910		)	98,619			7,305
Total income tax expense (benefit)	$	42,334		$	(22,736	)	$	98,921		$	7,740
	37.5		%	37.2		%	37.6		%	37.5		%