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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Compensation cost recognized $ 2,348,000 $ 2,293,000  
Allocated Share-based Compensation Expense 2,348,000 2,293,000  
Restricted Stock And Restricted Stock Unit (RSU) [Member]
     
Compensation cost recognized 1,600,000 1,000,000  
Allocated Share-based Compensation Expense 1,600,000 1,000,000  
Unrecognized compensation cost related to non-vested awards granted 14,100,000   16,000,000
Restricted Stock [Member]
     
Shares, Nonvested at January 1, 2012 828,475    
Shares, Granted 0    
Shares, Vested (153,325)    
Shares, Canceled (12,000)    
Shares, Nonvested at September 30, 2012 663,150    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2012 $ 23.08    
Weighted-Average Grant-Date Fair Value, Granted $ 0.00    
Weighted-Average Grant-Date Fair Value, Vested $ 17.75    
Weighted-Average Grant-Date Fair Value, Canceled $ 25.09    
Weighted-Average Grant-Date Fair Value, Nonvested at September 30, 2012 $ 24.28    
Weighted-average period to recognize compensation cost (in years) 2 years 5 months 19 days    
Restricted Stock Units (RSUs) [Member]
     
Shares, Nonvested at January 1, 2012 115,466    
Shares, Granted 0    
Shares, Vested (4,050)    
Shares, Canceled 0    
Shares, Nonvested at September 30, 2012 111,416    
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 75,627    
Weighted-average period to recognize compensation cost (in years) 3 years 11 months 27 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 6 months    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term 2 years 2 months 27 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value 2,965,350    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 4,368,621