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Derivative Instruments (Narrative) (Details) - Scenario, Forecast [Member]
$ in Thousands
1 Months Ended
Jun. 30, 2019
USD ($)
$ / $
May 31, 2019
USD ($)
$ / $
Dec. 31, 2018
USD ($)
$ / $
Derivative [Line Items]      
Purchase of derivative instruments $ 16,500 $ 30,000 $ 20,000
Foreign exchange rate 3.96 3.88 630.75