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Fair value measurements (Level 3 Rollforward) (Details) - Recurring Fair Value Measurements - Significant unobservable inputs (Level 3) - Derivative - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Level 3 Rollforward    
Beginning balance $ 30 $ (295)
Realized and unrealized gains (losses) included in derivative losses 2,371 (1,069)
Settlements (received) paid (307) 959
Ending balance 2,094 (405)
Gains (losses) relating to instruments still held at the reporting date included in derivative gains (losses) for the period $ 2,094 $ (342)