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Stock-Based Compensation Restricted Stock Units Summary (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
[Line Items]          
Outstanding, beginning balance, Number     556 701  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 62.85   $ 62.85   $ 47.68
Shares converted upon acquisition, number     579    
Shares converted upon acquisition, Weighted Average Grant Date Fair Value     $ 69.40    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     150 140  
Weighted average fair value     $ 67.61 $ 65.48  
Forfeited, Number     (79) (19)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 68.56    
Outstanding, ending balance, Number 761 494 761 494  
Vested and Released [Member]          
[Line Items]          
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures     445 328  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 53.01    
Released, Aggregate Intrinsic Value     $ 23,609 $ 12,533  
Vested but Not Released [Member]          
[Line Items]          
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures     11    
Released, Aggregate Intrinsic Value     $ 656    
Expected to Vest [Member]          
[Line Items]          
Outstanding, ending balance, Number 699   699    
Expected to vest, Aggregate Intrinsic Value $ 41,948   $ 41,948    
Long Term Performance Restricted Stock Award [Member]          
[Line Items]          
Expected volatility 0.00% 28.00% 28.00% 28.00%  
Risk-free interest rate 0.00% 1.40% 2.20% 1.10%  
Expected term (years)   2 years 6 months 2 years 1 month 6 days 1 year 8 months 12 days  
Weighted average fair value $ 0.00 $ 75.58 $ 78.56 $ 77.65