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Retirement and Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Retirement and Benefit Plans [Table Text Block] The following table presents the pension benefit costs:
 
 Three Months Ended
June 30
Six Months Ended
June 30
 2021202020212020
 (thousands)
Service cost$— $166 $— $334 
Interest cost23 1,473 47 2,946 
Expected return on plan assets— (1,372)— (2,746)
Amortization of actuarial (gain) loss(4)201 (9)403 
Plan settlement loss— — — 86 
Net periodic benefit expense$19 $468 $38 $1,023