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Other Current Assets (Schedule related to other current assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Current Assets [abstract]    
Derivative assets   $ 2,646
Income tax recoverable $ 2,553 136
Prepaid expenses 2,942 4,559
Other current assets $ 5,495 $ 7,341