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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 60,981 $ 15,880 $ 84,342 $ 17,782
Postretirement benefit plans:        
Net actuarial loss, net of tax of: (2021 - Three-month period $-, Six-month period $-; 2020 - Three-month period $-, Six-month period $3)       (8)
Pension settlement expense, net of tax of: (2021 - Three-month period $-, Six-month period $-; 2020 - Three-month period $-, Six-month period $23)       66
Amortization of unrecognized net periodic benefit costs, net of tax of: (2021 - Three-month period $34, Six-month period $69; 2020 - Three-month period $39, Six-month period $76)        
Net actuarial gain (100) (109) (200) (217)
Interest rate swap and foreign currency translation:        
Change in unrealized income (loss) on interest rate swap, net of tax of: (2021 - Three-month period $59, Six-month period $263; 2020 - Three-month period $766, Six-month period $414) 166 (174) 741 (1,171)
Change in foreign currency translation, net of tax of: (2021 - Three-month period $215, Six-month period $333; 2020 - Three-month period $842, Six-month period $340) 612 457 941 (963)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 678 174 1,482 (2,293)
TOTAL COMPREHENSIVE INCOME $ 61,659 $ 16,054 $ 85,824 $ 15,489