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Income Taxes - Accounting for Uncertainty in Income Taxes (Details Textual) - USD ($)
$ in Thousands
1 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes (Textual) [Abstract]        
Liability for unrecognized tax benefits $ 1,891 $ 4,079 $ 3,417 $ 3,713
Income tax related to accrued interest, net of federal benefit 400 $ 300 $ 200  
Unrecognized tax benefits that would favorably impact the tax rate 1,900      
Internal Revenue Service (IRS)        
Income Taxes (Textual) [Abstract]        
Additional Income tax payment on audit for 2010 through 2012 tax year 8,000      
Maximum        
Income Taxes (Textual) [Abstract]        
Unrecognized tax benefits decrease amount over next twelve months $ 300