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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]                      
Earnings from continuing operations $ 157,975 $ 157,305 $ 166,456 $ 109,409 $ 289,645 $ 159,455 $ 142,475 $ 155,088 $ 591,145 $ 746,663 $ 502,128
(Loss) earnings from discontinued operations, net                 (20,878) 65,002 6,764
Net earnings $ 141,569 $ 157,305 $ 139,959 $ 131,434 $ 296,448 $ 178,912 $ 164,058 $ 172,247 $ 570,267 $ 811,665 $ 508,892
Basic earnings (loss) per common share:                      
Earnings from continuing operations (in dollars per basic share) $ 1.08 $ 1.07 $ 1.10 $ 0.71 $ 1.86 $ 1.02 $ 0.92 $ 1.00 $ 3.94 $ 4.80 $ 3.23
Earnings from discontinued operations, net (in dollars per basic share)                 (0.14) 0.42 0.04
Net earnings (in dollars per basic share) 0.97 1.07 0.92 0.85 1.90 1.15 1.05 1.11 $ 3.80 $ 5.21 $ 3.28
Weighted average shares outstanding - basic (in shares)                 149,874,000 155,685,000 155,231,000
Diluted earnings (loss) per common share:                      
Earnings from continuing operations (in dollars per diluted share) 1.07 1.05 1.08 0.70 1.83 1.01 0.90 0.99 $ 3.89 $ 4.73 $ 3.21
Earnings (loss) from discontinued operations, net (in dollars per diluted share)                 (0.14) 0.41 0.04
Net earnings (in dollars per diluted share) $ 0.96 $ 1.05 $ 0.91 $ 0.84 $ 1.88 $ 1.14 $ 1.04 $ 1.09 $ 3.75 $ 5.15 $ 3.25
Weighted average shares outstanding - diluted (in shares)                 152,133,000 157,744,000 156,636,000
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 149,874,000 155,685,000 155,231,000
Dilutive effect of assumed exercise of employee stock options, SAR's and performance shares (in shares)                 2,259,000 2,059,000 1,405,000
Weighted average shares outstanding - diluted (in shares)                 152,133,000 157,744,000 156,636,000
Weighted average number of anti-dilutive potential common shares excluded from reconciliation calculations (in shares)                 1,382 79,756 6,799