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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net Earnings $ 41,304 $ 66,339
Net Actuarial Change in Defined Benefit Plans:    
Amortization of net actuarial loss 43 73
Tax expense (10) (17)
Comprehensive Earnings $ 41,337 $ 66,395