BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 30, 2021
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Benefit Cost	PENSION BENEFITSThree Months Ended Nine Months Ended September 30 September 30in thousands2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost$        1,193  $        1,331  $        3,580  $        3,993  Interest cost 4,879  7,531  14,638  22,593  Expected return on plan assets (11,375) (12,485) (34,125) (37,454) Amortization of prior service cost 337  335  1,010  1,005  Amortization of actuarial loss 2,178  3,140  6,535  9,419  Net periodic pension benefit credit$       (2,788) $          (148) $       (8,362) $          (444) Pretax reclassifications from AOCI included in net periodic pension benefit cost$        2,515  $        3,475  $        7,545  $      10,424
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Benefit Cost	OTHER POSTRETIREMENT BENEFITSThree Months Ended Nine Months Ended September 30 September 30in thousands2021 2020 2021 2020 Components of Net Periodic Benefit Cost Service cost$           265  $           380  $           795  $        1,140  Interest cost 107  242  319  727  Amortization of prior service credit (476) (980) (1,429) (2,939) Amortization of actuarial gain (367) (201) (1,101) (604) Net periodic postretirement benefit credit$          (471) $          (559) $       (1,416) $       (1,676) Pretax reclassifications from AOCI included in net periodic postretirement benefit credit$          (843) $       (1,181) $       (2,530) $       (3,543)