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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]    
Earnings from continuing operations $ 196,827 $ 174,791
Earnings (loss) from discontinued operations, net (764) 20,114
Net earnings $ 196,063 $ 194,905
Basic earnings (loss) per common share:    
Earnings from continuing operations (in dollars per share) $ 1.07 $ 0.94
Earnings (loss) from discontinued operations, net (in dollars per share) $ 0 $ 0.11
Net earnings (in dollars per share) $ 1.07 $ 1.04
Weighted average shares outstanding (in shares) 183,737 186,659
Diluted earnings (loss) per common share:    
Earnings from continuing operations (in dollars per share) $ 1.05 $ 0.92
Earnings (loss) from discontinued operations, net (in dollars per share) $ 0 $ 0.11
Net earnings (in dollars per share) $ 1.05 $ 1.03
Weighted average shares outstanding (in shares) 186,706 190,090
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]    
Weighted average shares outstanding - Basic (in shares) 183,737 186,659
Dilutive effect of assumed exercise of employee stock options, SAR's and performance shares (in shares) 2,969 3,431
Weighted average shares outstanding - Diluted (in shares) 186,706 190,090
Weighted average number of anti-dilutive potential common shares excluded from reconciliation calculations (in shares) 2,437 1,524