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Stock-Based Compensation (Details 1) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 656,611 670,009 598,346 617,446
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.76 $ 12.58 $ 16.26 $ 10.53
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Number 42,152 46,572 46,572 42,152
Share Based Compensation Arrangement by Share Based Payment Award SAR's Outstanding Weighted Average Exercise Price $ 14.14 $ 14.06 $ 14.06 $ 14.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 14,820 183,251 310,028  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.60 $ 2.19 $ 5.57  
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, Forfeitures in Period 27,019 25,752 238,365  
Share Based Compensation Arrangement by Share Based Payment Award Option Cancelled Forfeited in Period Weighted Average Grant Date Fair Value $ 21.88 $ 16.76 $ 12.69  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Forfeitures in Period 0 4,420 0  
Share Based Compensation Arrangement by Share Based Payment Award SAR's Cancelled Forfeited in Period Weighted Average Grant Date Fair Value $ 0.00 $ 13.31 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 26,966 170,897    
Share Based Compensation Arrangement by Share Based Payment Award Option Exercises in Period Weighted Average Grant Date Fair Value $ 3.28 $ 7.81    
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period 0 0    
Share Based Compensation Arrangement by Share Based Payment Award SAR's Exercises in Period Weighted Average Grant Date Fair Value $ 0.00 $ 0.00