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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period $ 1,046,562 $ 992,002
Other comprehensive income (loss) before reclassifications 548 6,356
Amounts reclassified from accumulated other comprehensive income(4) (2,677) (2,998)
Total other comprehensive income (loss), net of tax (2,129) 3,358
End of period 1,083,941 1,017,071
Totals    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 9,532 29,333
Total other comprehensive income (loss), net of tax (2,129) 3,358
End of period 7,403 32,691
Post-retirement plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 1,976 19,450
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income(4) 111 (383)
Total other comprehensive income (loss), net of tax 111 (383)
End of period 2,087 19,067
Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning of period 7,556 9,883
Other comprehensive income (loss) before reclassifications 548 6,356
Amounts reclassified from accumulated other comprehensive income(4) (2,788) (2,615)
Total other comprehensive income (loss), net of tax (2,240) 3,741
End of period 5,316 13,624
Tax expense 200 2,200
Reclassification from AOCI, current period, tax $ 1,000 $ 900