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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2019
Employee Benefit Plans Disclosure [Abstract]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Three Months EndedSix Months Ended
June 30,June 30,
2019201820192018
(in thousands)
Components of net periodic benefit cost:
Interest cost$123$118$255$250
Expected return on plan assets(170)(184)(352)(388)
Net amortization loss7152147110
Net periodic benefit cost (income) $24$(14)$50$(28)