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Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Oct. 29, 2015
Income Taxes (Textual) [Abstract]            
Extension of federal credit (in years)         1 year  
Income tax expense (benefit) $ (10,429) $ 12,917 $ (25,905) $ 42,751    
The American Taxpayer Relief Act of 2012 [Member]            
Income Taxes (Textual) [Abstract]            
Income tax expense (benefit)       $ (15,100)    
Minimum [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]            
Income Taxes (Textual) [Abstract]            
Potential additional tax payment 2,100          
Maximum [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]            
Income Taxes (Textual) [Abstract]            
Potential additional tax payment $ 8,700          
Subsequent Event [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]            
Income Taxes (Textual) [Abstract]            
Additional tax payment           $ 200