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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 7,000 $ 4,000 $ 2,000
Total fair value of vested stock options 6,000 7,000 9,000
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for accelerated vesting of stock options 710    
Recognized compensation expense for vesting of stock options $ 4,000 6,000 8,000
Total compensation cost not yet recognized, period for recognition fourth quarter 2018    
Restricted Stock Award [Member]      
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 15,000 $ 10,000 $ 7,000
Unvested share-based payment awards $ 23,000    
Total compensation cost not yet recognized, period for recognition fourth quarter 2018    
2013 Incentive Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares remaining available for grant (in shares) 11    
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    
Vesting period 4 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 3 years    
Vesting period 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 4 years    
Vesting period 3 years    
Executive Officer [Member] | Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 3 years  
Non-executive Employees [Member] | Restricted Stock Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years 4 years