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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested share-based payment awards $ 7,000  
Stock Based Compensation (Textuals) [Abstract]    
Intrinsic value of stock options exercised 10,000 $ 420
Total fair value of vested stock options $ 3,000 $ 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 $ 450  
Recognized compensation expense for vesting of stock options $ 1,000 $ 1,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition fourth quarter 2020  
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 7,000 $ 7,000
Unvested share-based payment awards $ 30,000  
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition fourth quarter 2020