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Fair value measurements (Level 3 Rollforward) (Details) - Recurring Fair Value Measurements - Significant unobservable inputs (Level 3) - Derivative - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Level 3 Rollforward    
Beginning balance $ 234 $ 30
Realized and unrealized gains included in derivative losses 1,033 441
Settlements (received) paid (1,767) 116
Ending balance (500) 587
(Losses) gains relating to instruments still held at the reporting date included in derivative gains (losses) for the period $ (430) $ 742