Income Taxes (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Income Taxes
Net deferred tax liability	$ 100,800		$ 100,800		$ 38,300
Increase to income tax provision	$ 35,380	$ 20,167	$ 62,016	$ 42,279
Increase in effective tax rate due to increase in valuation allowance (as a percent)					43.00
Percent of pretax (loss) income
Actual effective income tax rate (as a percent)	87.83%		86.41%
Restatement Adjustment
Income Taxes
Increase to income tax provision		12,125		18,683
Correction of the failed spin-off-leaseback accounting treatment
Income Taxes
Period of cumulative pre-tax loss position			3 years
Increase to income tax provision	$ 17,800		$ 30,900
Correction of the failed spin-off-leaseback accounting treatment | Restatement Adjustment
Income Taxes
Increase to income tax provision		$ 17,800		$ 34,500