Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income tax expense (benefit) $ (314) $ 250 $ (666) $ 353  
Effective income tax rate (as a percent) 36.00% 8.00% 40.00% 8.00%  
U.S. federal statutory rate (as a percent)     34.00%    
Minimum period for which net operating loss and credit carryforwards are subject to examinations and adjustments     3 years    
State          
Net operating losses         $ 86,100
Tax credit carryforwards         2,800
Federal          
Net operating losses         85,600
Tax credit carryforwards         $ 3,800