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Retirement and Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Retirement and Benefit Plans [Table Text Block] The following table presents the pension benefit costs:
 
 Three Months Ended
September 30
Nine Months Ended
September 30
 2020201920202019
 (thousands)
Service cost$167 $163 $501 $485 
Interest cost1,474 1,792 4,420 5,417 
Expected return on plan assets(1,374)(1,477)(4,120)(4,426)
Amortization of actuarial (gain) loss202 (44)605 (131)
Plan settlement loss— 1,342 86 1,342 
Net periodic benefit expense$469 $1,776 $1,492 $2,687