EMPLOYEE BENEFIT PLANS - Changes in Plan Assets, Benefit Obligations, and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in plan assets:
Other adjustments	$ (18,230)	$ (15,803)	$ (20,215)
Pension Benefits
Change in projected benefit obligation:
Beginning of year	692,091	710,769
Service cost	21,049	23,421	22,159
Interest cost	38,769	36,244	34,190
Actuarial (gain) loss	52,480	(54,744)
Benefits paid, net of retiree premiums	(25,961)	(23,599)
End of year	778,428	692,091	710,769
Change in plan assets:
Fair value of plan assets at beginning of year	750,047	716,273
Actual return on plan assets	112,164	53,687
Employer contributions	8,720	3,686
Retiree contributions and Medicare part D subsidies	0	0
Benefits paid	(25,961)	(23,599)
Other adjustments	0	0
Fair value of plan assets at end of year	844,970	750,047	716,273
Reconciliation of funded status
Funded status	66,542	57,956
Unrecognized actuarial gain	(133,152)	(123,431)
Unrecognized prior service cost	1,630	2,154
Net amount recognized	(64,980)	(63,321)
Short-term portion of the pension benefits	3,700	3,100
Other Benefits
Change in projected benefit obligation:
Beginning of year	128,269	134,733
Service cost	5,615	6,048	4,489
Interest cost	6,959	6,900	5,219
Actuarial (gain) loss	(12,310)	(17,131)
Benefits paid, net of retiree premiums	(2,420)	(2,281)
End of year	126,113	128,269	134,733
Change in plan assets:
Fair value of plan assets at beginning of year	174,354	163,367
Actual return on plan assets	27,413	13,269
Employer contributions	0	0
Retiree contributions and Medicare part D subsidies	2,541	2,446
Benefits paid	(5,146)	(4,906)
Other adjustments	185	178
Fair value of plan assets at end of year	199,347	174,354	$ 163,367
Reconciliation of funded status
Funded status	73,234	46,085
Unrecognized actuarial gain	(69,400)	(44,685)
Unrecognized prior service cost	1,118	1,273
Net amount recognized	$ 4,952	$ 2,673