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Accumulated Other Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2019
Accumulated Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income [Table Text Block]
Foreign currencyDerivatives
translation qualifying asDefined benefit
(in thousands)adjustmentshedgespension plansTotal
Balance at December 31, 2018$(12,630)$(170)$(732)$(13,532)
Other comprehensive income (loss) before reclassifications(191)(494)-(685)
Amounts reclassified from AOCI-36-36
Other comprehensive income (loss)(191)(458)-(649)
Balance at June 30, 2019$(12,821)$(628)$(732)$(14,181)