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Derivatives - Contracts designated as cash flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Derivatives    
Net gain (loss) recognized in OCI(1) $ 12 $ (154)
Net (gain) loss reclassified from accumulated OCI into income(2) $ 39 $ 121