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Stock Based Compensation - Options Summary (Details) (USD $)
6 Months Ended
Jun. 30, 2012
$4.62 - $9.24
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 4.62
Exercise Price Range, Upper Range Limit $ 9.24
Number of Outstanding Options, Exercise Price Range 47,325
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 2 years 7 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 6.93
Number of Exercisable Options, Exercise Price Range 47,325
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 6.93
$9.25 - $18.48
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 9.25
Exercise Price Range, Upper Range Limit $ 18.48
Number of Outstanding Options, Exercise Price Range 0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 0
Number of Exercisable Options, Exercise Price Range 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0
$18.49 - $23.11
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 18.49
Exercise Price Range, Upper Range Limit $ 23.11
Number of Outstanding Options, Exercise Price Range 89,216
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 4 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 18.86
Number of Exercisable Options, Exercise Price Range 59,150
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 18.88
$23.12 - $36.97
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 23.12
Exercise Price Range, Upper Range Limit $ 36.97
Number of Outstanding Options, Exercise Price Range 0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 0
Number of Exercisable Options, Exercise Price Range 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0
$36.98 - $41.59
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 36.98
Exercise Price Range, Upper Range Limit $ 41.59
Number of Outstanding Options, Exercise Price Range 69,120
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 6 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 37.76
Number of Exercisable Options, Exercise Price Range 11,283
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 37.37
$41.60 - $46.21
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Range Limit $ 41.60
Exercise Price Range, Upper Range Limit $ 46.21
Number of Outstanding Options, Exercise Price Range 2,192
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range 7 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range $ 46.21
Number of Exercisable Options, Exercise Price Range 0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range $ 0