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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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 556 701 756
Converted upon acquisition (in shares) 579    
Granted (in shares) 387 273 306
Forfeited (in shares) (112) (46) (49)
Outstanding, ending balance (in shares) 817 556 701
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 47.68 $ 38.04  
Shares converted upon acquisition (in dollars per share) 69.40    
Granted (in dollars per share) 57.48 50.95 $ 41.58
Forfeitures (in dollars per share) 67.88    
Outstanding, ending balance (in dollars per share) $ 59.70 $ 47.68 $ 38.04
Vested and Released [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued (in shares) (593) (372) (312)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Released (in dollars per share) $ 54.91    
Released, Aggregate Intrinsic Value $ 32,567 $ 14,219 $ 11,944
Vested but Not Released [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Issued (in shares) (124)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Released, Aggregate Intrinsic Value $ 5,867    
Expected to Vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, ending balance (in shares) 643    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Expected to vest, Aggregate Intrinsic Value $ 30,405