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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period $ 992,002 $ 1,046,721
Other comprehensive income before reclassifications 6,356 3,668
Amounts reclassified from accumulated other comprehensive income (loss) (2,998) 2,089
Total other comprehensive income, net of tax 3,358 5,757
End of period 1,017,071 1,099,124
Totals    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 29,333 8,585
Total other comprehensive income, net of tax 3,358 5,757
End of period 32,691 14,342
Post-retirement plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 19,450 8,811
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss) (383) (2)
Total other comprehensive income, net of tax (383) (2)
End of period 19,067 8,809
Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 9,883 (226)
Other comprehensive income before reclassifications 6,356 3,668
Amounts reclassified from accumulated other comprehensive income (loss) (2,615) 2,091
Total other comprehensive income, net of tax 3,741 5,759
End of period 13,624 5,533
Other comprehensive income (loss) before reclassifications, tax expense $ 2,200 $ 1,300