Income Taxes (Tables)

6 Months Ended

Jun. 30, 2012

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,
	2012			2011			2012			2011
	(in thousands)
Current portion of income tax benefit (expense):
Federal	$	—		$	(2,212	)	$	—		$	(9,156	)
State	132			(224		)	(261		)	(399		)
Deferred portion of income tax expense	(14,927		)	(70,415		)	(30,215		)	(52,241		)
Total income tax expense	$	(14,795	)	$	(72,851	)	$	(30,476	)	$	(61,796	)
Effective tax rate	37.3		%	36.9		%	37.3		%	36.8		%