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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 165,233 $ 161,388
Other comprehensive income, net of tax:    
Change in unrealized gain (loss) on derivatives designated as cash flow hedges (2,240) 3,741
Change in postretirement plan costs 111 (383)
Total other comprehensive income (loss), net of tax (2,129) 3,358
Comprehensive income attributable to common stockholders $ 163,104 $ 164,746