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Stock-Based Compensation (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 656,611 670,009 598,346 415,570
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.76 $ 12.58 $ 16.26 $ 27.36
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Number 42,152 46,572 46,572 50,209
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Weighted Average Exercise Price $ 14.14 $ 14.06 $ 14.06 $ 14.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 183,251 310,028 415,172  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 2.19 $ 5.57 $ 9.45  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Grants in Period 0 0 0  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Grants in Period Weighted Average Grant Date Fair Value $ 0.00 $ 0.00 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (170,897)      
Share Based Compensation Arrangement by Share Based Payment Award Option Exercises in Period Weighted Average Grant Date Fair Value $ 7.81      
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period 0      
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period Weighted Average Grant Date Fair Value $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (25,752) (238,365) (232,396)  
Share Based Compensation Arrangement by Share Based Payment Award Option Cancelled Forfeited in Period Weighted Average Grant Date Fair Value $ 16.76 $ 12.69 $ 23.94  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Forfeitures in Period (4,420) 0 (3,637)  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Cancelled Forfeited in Period Weighted Average Grant Date Fair Value $ 13.31 $ 0.00 $ 15.40  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 656,611      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 10.76      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 7 years 4 months 8 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 1,753      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options 292,524      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price $ 18.31      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 11 months 20 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 618,870      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 11.20      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price 7 years 3 months 7 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 1,555      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 118      
Zero to Ten Dollars [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 455,578      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 5.32      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 8 years 2 months 8 days      
Ten Dollars to Twenty Dollars [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 52,616      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 13.33      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 6 years 7 months 19 days      
Twenty Dollars to Thirty Dollars [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 141,947      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 25.73      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 5 years 3 months 3 days      
Thirty Dollars to Forty Dollars [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 3,134      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 39.90      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 2 months 18 days      
Forty Dollars to Fifty Dollars [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 3,336      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 48.50      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 1 year 12 days