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Derivative Instruments, (Loss) Gain on Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net (Loss) Gain on Derivative Instruments [Abstract]    
Interest rate swap - change in fair value $ (97) $ (26)
Foreign exchange contracts - change in fair value 17 102
Remeasurement of related contract receivables, and billings in excess of revenue earned 37 17
(Loss) gain on derivative instruments, net $ (43) $ 93