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Fair Value Measurements - Level 3 Rollforward Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net derivative balance at beginning of period $ (39,507) $ (48,814) $ (32,979) $ (41,386)
Included in OCI 104 25 104 (237)
Deferred as a regulatory asset or liability 1,499 5,813 (7,604) (4,933)
Settlements 4,502 4,541 6,267 4,852
Transfers into Level 3 from Level 2 120 (3,566) 382 (3,968)
Transfers from Level 3 into Level 2 902 (944) 1,450 2,727
Net derivative balance at end of period (32,380) (42,945) (32,380) (42,945)
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0 $ 0 $ 0