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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of the provision for income taxes
Federal	$ 0	$ 0	$ 0	$ 0
State	512	246	1,001	348
Deferred portion of income tax expense	35,537	45,959	73,911	56,239
Income tax expense	$ 36,049	$ 46,205	$ 74,912	$ 56,587
Effective tax rate	37.60%	37.60%	37.40%	37.80%

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.