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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Stock Based Compensation (Textuals) [Abstract]    
Intrinsic value of stock options exercised $ 11,000 $ 1,000
Total fair value of vested stock options $ 4,000 $ 3,000
Service-based Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years 4 years
Performance-based Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years 3 years
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognized compensation expense for accelerated vesting of stock options $ 570  
Recognized compensation expense for vesting of stock options 2,000 $ 2,000
Unvested share-based payment awards $ 7,000  
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition first quarter 2021  
Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognized compensation expense for accelerated vesting of stock options $ 2,000  
Recognized compensation expense for vesting of stock options 11,000 $ 11,000
Unvested share-based payment awards $ 26,000  
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition first quarter 2021