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Accumulated Other Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2019
Accumulated Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income [Table Text Block]
September 30,December 31,
20192018
(in thousands)
Foreign currency translation adjustments$(14,316)$(12,630)
Derivatives qualifying as hedges(669)(170)
Defined benefit pension plans(732)(732)
Total$(15,717)$(13,532)