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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Taxes      
Net deferred tax assets $ 56,400   $ 38,300
Income tax provision $ 10,415 $ 2,001  
Effective income tax rate (as a percent) 84.78% 77.52%  
Percent of pretax (loss) income      
Actual effective income tax rate (as a percent) 84.78% 77.52%  
Correction of the failed spin-off-leaseback accounting treatment      
Income Taxes      
Income tax provision $ 5,100 $ 200