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Stock-Based Compensation (Details Textuals) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Stock Based Compensation (Textuals) [Abstract]    
Intrinsic value of stock options exercised $ 12,000,000 $ 2,000,000
Total fair value of vested stock options $ 4,000,000 $ 3,000,000
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 $ 570,000  
Recognized compensation expense for vesting of stock options 3,000,000 $ 3,000,000
Unvested share-based payment awards $ 5,000,000  
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 $ 2,000,000  
Recognized compensation expense for vesting of stock options 14,000,000 $ 15,000,000
Unvested share-based payment awards $ 22,000,000  
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition first quarter 2021