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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Restricted Stock And Restricted Stock Unit (RSU) [Member]
Jun. 30, 2012
Restricted Stock And Restricted Stock Unit (RSU) [Member]
Dec. 31, 2011
Restricted Stock And Restricted Stock Unit (RSU) [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Compensation cost recognized $ 2,155,000 $ 2,231,000 $ 4,448,000 $ 4,436,000 $ 1,100,000 $ 2,100,000      
Allocated Share-based Compensation Expense 2,155,000 2,231,000 4,448,000 4,436,000 1,100,000 2,100,000      
Shares, Nonvested at January 1, 2012               742,683 32,750
Shares, Granted               88,544 64,166
Shares, Vested               (184,652) (1,500)
Shares, Canceled               (900) 0
Shares, Nonvested at March 31, 2012               645,675 95,416
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares                 60,453
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2012               $ 20.87  
Weighted-Average Grant-Date Fair Value, Granted               $ 25.47  
Weighted-Average Grant-Date Fair Value, Vested               $ 20.37  
Weighted-Average Grant-Date Fair Value, Canceled               $ 29.21  
Weighted-Average Grant-Date Fair Value, Nonvested at March 31, 2012               $ 21.63  
Weighted-average period to recognize compensation cost (in years)               2 years 2 months 19 days 4 years 5 months 5 days
Unrecognized compensation cost related to non-vested awards granted         12,700,000 12,700,000 11,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms                 3 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term                 3 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value                 1,597,179
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value                 $ 2,520,891