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Derivatives - Contracts designated as cash flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivatives        
Net loss recognized in OCI $ (301)   $ (301) $ (166)
Net loss reclassified from accumulated OCI into income $ 34 $ 87 $ 34 $ 82