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Fair Value Measurements - Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Level 3 Roll-Forward Net Asset(Liability)      
Balance at beginning of period $ 3,021 $ 1,597 $ (9,728)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Included in earnings 34,604 2,781 4,007
Included in regulatory assets / liabilities 6,075 6,346 4,312
Settlements (40,264) (12,921) (3,808)
Transferred into Level 3 (1,987) (30) (3,021)
Transferred out Level 3 1,586 5,248 9,835
Balance at end of period 3,035 3,021 1,597
Electric Portfolio      
Level 3 Roll-Forward Net Asset(Liability)      
Balance at beginning of period 1,098 972 (7,345)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Included in earnings 34,604 2,781 4,007
Included in regulatory assets / liabilities 0 0 0
Settlements (33,067) (6,549) (1,129)
Transferred into Level 3 (1,987) 523 (3,021)
Transferred out Level 3 714 3,371 8,460
Balance at end of period 1,362 1,098 972
Unrealized gain (loss) on derivative instruments, net 1,100 1,500 2,000
Natural Gas Portfolio      
Level 3 Roll-Forward Net Asset(Liability)      
Balance at beginning of period 1,923 625 (2,383)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Included in earnings 0 0 0
Included in regulatory assets / liabilities 6,075 6,346 4,312
Settlements (7,197) (6,372) (2,679)
Transferred into Level 3 0 (553) 0
Transferred out Level 3 872 1,877 1,375
Balance at end of period $ 1,673 $ 1,923 $ 625