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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Compensation cost recognized $ 2,770,000 $ 2,191,000 $ 8,943,000 $ 6,538,000  
Allocated Share-based Compensation Expense 2,770,000 $ 2,191,000 8,943,000 6,538,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]          
Compensation cost recognized     8,300,000 5,500,000  
Allocated Share-based Compensation Expense     8,300,000 $ 5,500,000  
Unrecognized compensation cost related to non-vested awards granted $ 35,600,000   $ 35,600,000   $ 24,100,000
Restricted Stock [Member]          
Nonvested at January 1, 2015     814,050    
Shares, Granted     211,040    
Shares, Vested     (155,733)    
Shares, Canceled     (84,515)    
Nonvested at September 30, 2015 784,842   784,842    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2015     $ 26.57    
Weighted-Average Grant-Date Fair Value, Granted     67.06    
Weighted-Average Grant-Date Fair Value, Vested     35.19    
Weighted-Average Grant-Date Fair Value, Canceled     40.55    
Weighted-Average Grant-Date Fair Value, Nonvested at September 30, 2015 $ 34.24   $ 34.24    
Weighted-average period to recognize compensation cost (in years)     2 years 10 months 28 days    
Restricted Stock Units (RSUs) [Member]          
Nonvested at January 1, 2015     102,924    
Shares, Granted     15,900    
Shares, Vested     (17,081)    
Shares, Canceled     (37,058)    
Nonvested at September 30, 2015 64,685   64,685    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares     49,599    
Weighted-average period to recognize compensation cost (in years)     3 years 4 months 13 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     1 year 10 months 17 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 7 months 21 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 3,515,573   $ 3,515,573    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 4,584,873   $ 4,584,873