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Other Comprehensive Income Details 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net earnings $ 126,653 $ 104,950 $ 331,425 $ 298,996 $ 375,972
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (17,808) 20,749 (18,123) 77,361 $ 89,592
Comprehensive Income, Net of Tax (Note 9) $ 108,845 $ 125,699 $ 313,302 $ 376,357