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Stock-based Compensation (Details 2) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock reserved for future issuance under all of the stock incentive plans 7,451,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at beginning of period 2,013,000    
Granted 771,000    
Vested (812,000)    
Forfeited (221,000)    
Outstanding at end of period 1,751,000 2,013,000  
Vested not distributed 216,000    
Weighted Average Grant-Date Fair Value      
Outstanding at beginning of period $ 31.86    
Granted 52.83    
Vested 31.17    
Forfeited 34.47    
Outstanding at end of period $ 40.77 $ 31.86  
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock reserved for future issuance under all of the stock incentive plans 2,838,000    
Weighted Average Grant-Date Fair Value      
Granted $ 10.01 $ 7.66 $ 6.33