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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2019
Employee Benefit Plans Disclosure [Abstract]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Three Months EndedNine Months Ended
September 30,September 30,
2019201820192018
(in thousands)
Components of net periodic benefit cost:
Interest cost$121$121$376$371
Expected return on plan assets(167)(187)(519)(575)
Net amortization loss6953216163
Curtailment gain-(41)-(41)
Net periodic benefit cost (income) $23$(54)$73$(82)