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Derivatives - Contracts designated as cash flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivatives        
Net loss recognized in OCI $ (302) $ 12 $ (536) $ (154)
Net loss reclassified from accumulated OCI into income $ 37 $ 39 $ 4 $ 121