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Fair Value Measurements - Changes in Fair Value of Risk Management Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Total net gains (losses) realized/unrealized:    
Net derivative beginning balance $ (8,214) $ (18,256)
Included in earnings 0 0
Included in OCI 0 0
Deferred as a regulatory asset or liability (13,457) (1,130)
Settlements 12,250 (787)
Transfers into Level 3 from Level 2 (6,512) (12,830)
Transfers from Level 3 into Level 2 12,537 24,789
Net derivative ending balance (3,396) (8,214)
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0