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Derivative Instruments - Designated as hedging, Financial Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Net Investment Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 2,100 $ 130