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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Compensation cost recognized $ 3,168,000 $ 1,963,000 $ 6,173,000 $ 4,347,000  
Allocated Share-based Compensation Expense 3,168,000 $ 1,963,000 6,173,000 4,347,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]          
Compensation cost recognized     5,700,000 3,600,000  
Allocated Share-based Compensation Expense     5,700,000 $ 3,600,000  
Unrecognized compensation cost related to non-vested awards granted $ 33,900,000   $ 33,900,000   $ 24,100,000
Restricted Stock [Member]          
Nonvested at January 1, 2015     814,050    
Shares, Granted     147,440    
Shares, Vested     (124,683)    
Shares, Canceled     (74,515)    
Nonvested at June 30, 2015 762,292   762,292    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2015     $ 26.57    
Weighted-Average Grant-Date Fair Value, Granted     66.04    
Weighted-Average Grant-Date Fair Value, Vested     36.69    
Weighted-Average Grant-Date Fair Value, Canceled     38.17    
Weighted-Average Grant-Date Fair Value, Nonvested at March 31, 2015 $ 31.41   $ 31.41    
Weighted-average period to recognize compensation cost (in years)     2 years 11 months 19 days    
Restricted Stock Units (RSUs) [Member]          
Nonvested at January 1, 2015     102,924    
Shares, Granted     10,900    
Shares, Vested     (13,081)    
Shares, Canceled     (7,790)    
Nonvested at June 30, 2015 92,953   92,953    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares     71,843    
Weighted-average period to recognize compensation cost (in years)     3 years 3 months 4 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 21 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 8 months 9 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 4,880,982   $ 4,880,982    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 6,315,227   $ 6,315,227