Income Taxes (Tables)

6 Months Ended

Jun. 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 June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
	(in thousands)
Current portion of income tax expense (benefit):
Federal	$	—		$	—		$	—		$	—
State	246			(132		)	348			261
Deferred portion of income tax expense	45,959			14,927			56,239			30,215
Total income tax expense	$	46,205		$	14,795		$	56,587		$	30,476
Effective tax rate	37.6		%	37.3		%	37.8		%	37.3		%