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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, 2018
Dec. 31, 2017
Total net gains (losses) realized/unrealized:    
Net derivative beginning balance $ (18,256) $ (47,406)
Included in earnings 0 0
Included in OCI 0 3
Deferred as a regulatory asset or liability (1,130) (13,643)
Settlements (787) 5,834
Transfers into Level 3 from Level 2 (12,830) (10,026)
Transfers from Level 3 into Level 2 24,789 46,982
Net derivative ending balance (8,214) (18,256)
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0