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Stock Options And Employee Stock Purchase Plan (Restricted Stock) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation cost recognized $ 9,720,000 $ 9,132,000 $ 8,993,000
Allocated Share-based Compensation Expense 9,720,000 9,132,000 8,993,000
Restricted Stock And Restricted Stock Unit (RSU) [Member]
     
Compensation cost recognized 7,100,000 5,200,000 3,900,000
Allocated Share-based Compensation Expense 7,100,000 5,200,000 3,900,000
Shares, Granted 729,137 390,210 130,212
Unrecognized compensation cost related to non-vested awards granted 20,200,000    
Restricted Stock [Member]
     
Shares, Nonvested at January 1, 2013 828,475    
Shares, Granted 690,762    
Shares, Vested (296,966)    
Shares, Canceled (43,900)    
Shares, Nonvested at December 31, 2013 1,178,371    
Weighted-Average Grant-Date Fair Value, Nonvested at January 1, 2013 $ 23.08    
Weighted-Average Grant-Date Fair Value, Granted $ 13.57    
Weighted-Average Grant-Date Fair Value, Vested $ 21.46    
Weighted-Average Grant-Date Fair Value, Canceled $ 24.46    
Weighted-Average Grant-Date Fair Value, Nonvested at December 31, 2013 $ 17.86    
Weighted-average period to recognize compensation cost (in years) 3 years 0 months 4 days    
Restricted Stock Units (RSUs) [Member]
     
Shares, Nonvested at January 1, 2013 115,466 32,750  
Shares, Granted 38,375 91,166  
Shares, Vested (11,116) 1,700  
Shares, Canceled (33,000) 6,750  
Shares, Nonvested at December 31, 2013 109,725 115,466  
Share Based Compensation Equity Awards Other Than Options Expected To Vest Shares 74,509    
Weighted-average period to recognize compensation cost (in years) 3 years 7 months 21 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 2 years 2 months 9 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 11 months 5 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value 3,726,174    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding, Aggregate Intrinsic Value $ 5,487,347