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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
NET INCOME $ 180,767 $ 196,870 $ 215,881 $ 196,532
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX        
Derivative instruments net unrealized gain (loss), net of tax benefit (expense) of $(6), $(18), $8 and $(18) 18 (294) (25) 56
Pension and other postretirement benefit activity, net of tax benefit (expense) of $(295), $69, $(460) and $(95) 897 (53) 1,399 445
Total other comprehensive income (loss) 915 (347) 1,374 501
COMPREHENSIVE INCOME 181,682 196,523 217,255 197,033
Less: Comprehensive income attributable to noncontrolling interests 2,193 4,306 4,387 8,612
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS $ 179,489 $ 192,217 $ 212,868 $ 188,421