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Stock Options (Details) - Employee Stock Option [Member] - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of options granted (in dollars per share) $ 1.11 $ 1.36 $ 1.35
Risk-free interest rate   1.73% 1.68%
Expected life (years)     5 years
Expected volatility factor   49.00% 55.00%
Expected dividends
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.26%    
Expected life (years) 5 years 5 years  
Expected volatility factor 47.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.93%    
Expected life (years) 6 years 6 years  
Expected volatility factor 49.00%