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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Compensation cost recognized $ 6,313,000 $ 5,086,000  
Share-based Payment Arrangement, Expense 6,313,000 5,086,000  
Share-based Payment Arrangement, Option [Member]      
Compensation cost recognized 200,000 200,000  
Share-based Payment Arrangement, Expense 200,000 200,000  
Unrecognized compensation cost related to non-vested awards granted $ 6,600,000   $ 6,800,000
Weighted-average period to recognize compensation cost (in years) 5 years 8 months 12 days    
Restricted Stock And Restricted Stock Unit (RSU) [Member]      
Compensation cost recognized $ 5,600,000 4,500,000  
Share-based Payment Arrangement, Expense 5,600,000 $ 4,500,000  
Unrecognized compensation cost related to non-vested awards granted $ 54,300,000   $ 46,100,000
Restricted Stock [Member]      
Nonvested at January 1, 2020 1,105,059    
Shares, Granted 1,268    
Shares, Vested (173,708)    
Shares, Canceled (4,681)    
Nonvested at March 31, 2020 927,938    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2020 $ 64.76    
Weighted-Average Grant-Date Fair Value, Granted 98.63    
Weighted-Average Grant-Date Fair Value, Vested 65.97    
Weighted-Average Grant-Date Fair Value, Canceled 77.13    
Weighted-Average Grant-Date Fair Value, Nonvested at March 31, 2020 $ 64.51    
Weighted-average period to recognize compensation cost (in years) 4 years 7 months 6 days    
Restricted Stock Units (RSUs) [Member]      
Nonvested at January 1, 2020 20,874    
Shares, Granted 179,361    
Shares, Vested (3,788)    
Shares, Canceled (1,920)    
Nonvested at March 31, 2020 194,527    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 115,546    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 4 years 7 months 6 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term 3 years 10 months 24 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 14,560,346    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 8,648,626    
Weighted-average period to recognize compensation cost (in years) 5 years 7 months 6 days