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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested share-based payment awards $ 5,000    
Stock Based Compensation (Textuals) [Abstract]      
Intrinsic value of stock options exercised 9,000 $ 7,000 $ 4,000
Total fair value of vested stock options $ 3,000 6,000 7,000
Service-based Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Performance-based Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for accelerated vesting of stock options $ 940    
Recognized compensation expense for vesting of stock options 4,000 4,000 6,000
Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for accelerated vesting of stock options 3,000    
Recognized compensation expense for vesting of stock options 18,000 $ 15,000 $ 10,000
Unvested share-based payment awards $ 20,000    
2013 Incentive Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares remaining available for grant (in shares) 7    
2013 Incentive Compensation Plan [Member] | Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration term of awards 10 years    
2013 Incentive Compensation Plan [Member] | Service-based Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of transfer restrictions 4 years    
2013 Incentive Compensation Plan [Member] | Performance-based Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of transfer restrictions 3 years    
Executive Officer [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 4 years 4 years
Non-executive Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 4 years 4 years