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Equity Incentive Plans and Stock-Based Compensation (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2011
Y
Exercise price range $3.82 - $11.31
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 3.82
Exercise price range, high end of range (in dollars per share) $ 11.31
Options Outstanding  
Number Outstanding (in shares) 1,604,986
Weighted Average Remaining Contractual Life (in years) 5.74
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 8.03
Options Exercisable  
Number Exercisable (in shares) 964,767
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.48
Exercise price range $11.39 - $14.89
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 11.39
Exercise price range, high end of range (in dollars per share) $ 14.89
Options Outstanding  
Number Outstanding (in shares) 1,577,402
Weighted Average Remaining Contractual Life (in years) 5.46
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 14.23
Options Exercisable  
Number Exercisable (in shares) 1,043,121
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 14.11
Exercise price range $15.23 - $17.95
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 15.23
Exercise price range, high end of range (in dollars per share) $ 17.95
Options Outstanding  
Number Outstanding (in shares) 1,527,818
Weighted Average Remaining Contractual Life (in years) 3.63
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.94
Options Exercisable  
Number Exercisable (in shares) 1,406,188
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 16.96
Exercise price range $18.04 - $18.69
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 18.04
Exercise price range, high end of range (in dollars per share) $ 18.69
Options Outstanding  
Number Outstanding (in shares) 1,697,627
Weighted Average Remaining Contractual Life (in years) 4.76
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 18.61
Options Exercisable  
Number Exercisable (in shares) 1,621,495
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 18.61
Exercise price range $19.13 - $19.86
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 19.13
Exercise price range, high end of range (in dollars per share) $ 19.86
Options Outstanding  
Number Outstanding (in shares) 1,927,709
Weighted Average Remaining Contractual Life (in years) 5.92
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 19.63
Options Exercisable  
Number Exercisable (in shares) 1,521,929
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 19.61
Exercise price range $20.16 - $20.86
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 20.16
Exercise price range, high end of range (in dollars per share) $ 20.86
Options Outstanding  
Number Outstanding (in shares) 196,622
Weighted Average Remaining Contractual Life (in years) 8.42
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 20.37
Options Exercisable  
Number Exercisable (in shares) 58,078
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 20.4
Exercise price range $20.93 - $20.93
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 20.93
Exercise price range, high end of range (in dollars per share) $ 20.93
Options Outstanding  
Number Outstanding (in shares) 1,467,812
Weighted Average Remaining Contractual Life (in years) 9.05
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 20.93
Options Exercisable  
Number Exercisable (in shares) 245,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 20.93
Exercise price range $21.14 - $22.72
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 21.14
Exercise price range, high end of range (in dollars per share) $ 22.72
Options Outstanding  
Number Outstanding (in shares) 1,550,770
Weighted Average Remaining Contractual Life (in years) 7.13
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 22.45
Options Exercisable  
Number Exercisable (in shares) 758,296
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 22.24
Exercise price range $22.77 - $26.45
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 22.77
Exercise price range, high end of range (in dollars per share) $ 26.45
Options Outstanding  
Number Outstanding (in shares) 1,617,650
Weighted Average Remaining Contractual Life (in years) 4.46
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 23.75
Options Exercisable  
Number Exercisable (in shares) 1,390,004
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 23.83
Exercise price range $27.32 - $46.80
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 27.32
Exercise price range, high end of range (in dollars per share) $ 46.80
Options Outstanding  
Number Outstanding (in shares) 1,419,200
Weighted Average Remaining Contractual Life (in years) 2.82
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 34.62
Options Exercisable  
Number Exercisable (in shares) 1,419,200
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 34.62
Exercise price range $3.82 - $46.80
  
Exercise price range  
Exercise price range, low end of range (in dollars per share) $ 3.82
Exercise price range, high end of range (in dollars per share) $ 46.80
Options Outstanding  
Number Outstanding (in shares) 14,587,596
Weighted Average Remaining Contractual Life (in years) 5.49
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 19.73
Options Exercisable  
Number Exercisable (in shares) 10,428,578
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 20.26