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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Compensation cost recognized $ 5,562,000 $ 3,439,000 $ 9,177,000 $ 6,248,000  
Allocated Share-based Compensation Expense 5,562,000 3,439,000 9,177,000 6,248,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]          
Compensation cost recognized 5,500,000 3,200,000 9,100,000 6,000,000  
Allocated Share-based Compensation Expense 5,500,000 3,200,000 9,100,000 6,000,000  
Unrecognized compensation cost related to non-vested awards granted $ 45,800,000   $ 45,800,000   $ 37,900,000
Restricted Stock [Member]          
Nonvested at January 1, 2017     705,015    
Shares, Granted     219,220    
Shares, Vested     (176,341)    
Shares, Canceled     (1,850)    
Nonvested at June 30, 2017 746,044   746,044    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2017     $ 41.40    
Weighted-Average Grant-Date Fair Value, Granted     54.40    
Weighted-Average Grant-Date Fair Value, Vested     45.17    
Weighted-Average Grant-Date Fair Value, Canceled     87.68    
Weighted-Average Grant-Date Fair Value, Nonvested at June 30, 2017 $ 44.22   $ 44.22    
Weighted-average period to recognize compensation cost (in years)     3 years 8 months 5 days    
Restricted Stock Units (RSUs) [Member]          
Nonvested at January 1, 2017     51,950    
Shares, Granted     7,100    
Shares, Vested     (9,530)    
Shares, Canceled     (6,680)    
Nonvested at June 30, 2017 42,840   42,840    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares     32,409    
Weighted-average period to recognize compensation cost (in years)     3 years 4 months 28 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     1 year 11 months 1 day    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term     1 year 8 months 1 day    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 2,757,659   $ 2,757,659    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value 3,645,256   3,645,256    
Employee Stock Option [Member]          
Compensation cost recognized 50,000 100,000 100,000 200,000  
Allocated Share-based Compensation Expense 50,000 $ 100,000 $ 100,000 $ 200,000  
Weighted-average period to recognize compensation cost (in years)     2 years 8 months 16 days    
Unrecognized compensation cost related to non-vested awards granted $ 500,000   $ 500,000   $ 700,000