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Certain Employee Benefit and Stock-Based Compensation Plans (Summary of Nonvested Incentive/Performance Unit Share Awards and Restricted Stock/Unit Awards-Rollforward) (Details) (USD $)
In Thousands, except Per Share data
9 Months Ended
Sep. 30, 2011
Nonvested Incentive Performance Unit Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Nonvested Cash-Payable Restricted Unit Shares, Beginning balance363
Granted623
Vested/released(156)
Nonvested Cash-Payable Restricted Unit Shares, Ending balance830
Weighted-average grant date fair value, beginning of period$ 56.40
Weighted-average grant date fair value, granted shares$ 64.21
Weighted-average grant date fair value, vested/released shares$ 59.54
Weighted-average grant date fair value, end of period$ 61.68
Nonvested Restricted Stock Unit Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Nonvested Cash-Payable Restricted Unit Shares, Beginning balance2,250
Granted955
Vested/released(433)
Forfeited(83)
Nonvested Cash-Payable Restricted Unit Shares, Ending balance2,689
Weighted-average grant date fair value, beginning of period$ 49.95
Weighted-average grant date fair value, granted shares$ 63.62
Weighted-average grant date fair value, vested/released shares$ 58.84
Weighted-average grant date fair value, forfeited shares$ 51.73
Weighted-average grant date fair value, end of period$ 53.32