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Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Taxes [Line Items]          
U.S. federal statutory tax rate (as a percent) 35.00%   35.00%    
Unrecognized Tax Benefits $ 300   $ 300   $ 300
Income Tax Expense (Benefit) $ 4,177 $ 4,168 $ 6,350 $ 8,766  
Effective Income Tax Rate Reconciliation, Percent 44.80% 40.40% 45.60% 39.10%  
Restatement Adjustment [Member]          
Income Taxes [Line Items]          
Income Tax Expense (Benefit)     $ 1,000