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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Compensation cost recognized $ 6,446,000 $ 7,906,000 $ 18,394,000 $ 21,393,000  
Share-based Payment Arrangement, Expense 6,446,000 7,906,000 18,394,000 21,393,000  
Share-based Payment Arrangement, Option [Member]          
Compensation cost recognized 200,000 200,000 700,000 700,000  
Share-based Payment Arrangement, Expense 200,000 200,000 700,000 700,000  
Unrecognized compensation cost related to non-vested awards granted 7,100,000   $ 7,100,000   $ 6,900,000
Weighted-average period to recognize compensation cost (in years)     6 years 2 months 12 days    
Restricted Stock And Restricted Stock Unit (RSU) [Member]          
Compensation cost recognized 5,900,000 7,500,000 $ 16,700,000 20,200,000  
Share-based Payment Arrangement, Expense 5,900,000 $ 7,500,000 16,700,000 $ 20,200,000  
Unrecognized compensation cost related to non-vested awards granted $ 51,900,000   $ 51,900,000   $ 61,600,000
Restricted Stock [Member]          
Nonvested at January 1, 2019     1,207,011    
Shares, Granted     171,617    
Shares, Vested     (155,799)    
Shares, Canceled     (92,569)    
Nonvested at September 30, 2019 1,130,260   1,130,260    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2019     $ 64.82    
Weighted-Average Grant-Date Fair Value, Granted     78.50    
Weighted-Average Grant-Date Fair Value, Vested     74.09    
Weighted-Average Grant-Date Fair Value, Canceled     72.38    
Weighted-Average Grant-Date Fair Value, Nonvested at September 30, 2019 $ 64.74   $ 64.74    
Weighted-average period to recognize compensation cost (in years)     5 years 2 months 12 days    
Restricted Stock Units (RSUs) [Member]          
Nonvested at January 1, 2019     41,231    
Shares, Granted     3,844    
Shares, Vested     (11,947)    
Shares, Canceled     (8,499)    
Nonvested at September 30, 2019 24,629   24,629    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares     18,368    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     2 years 3 months 18 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term     1 year 9 months 18 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 2,236,806   $ 2,236,806    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 1,668,217   $ 1,668,217    
Weighted-average period to recognize compensation cost (in years)     3 years 3 months 18 days