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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Compensation cost recognized $ 9,132,000 $ 8,993,000 $ 10,937,000
Allocated Share-based Compensation Expense 9,132,000 8,993,000 10,937,000
Restricted Stock And Restricted Stock Unit (RSU) [Member]
     
Compensation cost recognized 5,200,000 3,900,000 4,000,000
Allocated Share-based Compensation Expense 5,200,000 3,900,000 4,000,000
Shares, Granted 390,210 130,212 101,082
Unrecognized compensation cost related to non-vested awards granted 16,000,000    
Restricted Stock [Member]
     
Shares, Nonvested at January 1, 2012 742,683    
Shares, Granted 299,044    
Shares, Vested (202,352)    
Shares, Canceled (10,900)    
Shares, Nonvested at December 31, 2012 828,475    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2012 $ 20.87    
Weighted-Average Grant-Date Fair Value, Granted $ 27.68    
Weighted-Average Grant-Date Fair Value, Vested $ 21.34    
Weighted-Average Grant-Date Fair Value, Canceled $ 30.92    
Weighted-Average Grant-Date Fair Value, Nonvested at December 31, 2012 $ 23.08    
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 32,750 17,500  
Shares, Granted 91,166 17,000  
Shares, Vested (1,700) (1,750)  
Shares, Canceled (6,750) 0  
Shares, Nonvested at December 31, 2012 115,466 32,750  
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 76,459    
Weighted-average period to recognize compensation cost (in years) 4 years 2 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 7 months 28 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Remaining Contractual Term 2 years 4 months 13 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value 2,339,659    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 3,533,260