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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2017
Employee Benefit Plans Disclosure [Abstract]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Three Months EndedNine Months Ended
September 30,September 30,
2017201620172016
(in thousands)
Components of net periodic benefit cost:
Interest cost$141$156$399$492
Expected return on plan assets(179)(168)(505)(530)
Net amortization loss9874276233
Net periodic benefit cost$60$62$170$195