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Fair Value Measurements - Level 3 Rollforward Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net derivative balance at beginning of period $ (32,380) $ (42,945) $ (32,979) $ (41,386)
Included in OCI (10) (207) 94 (444)
Deferred as a regulatory asset or liability (13,499) (5,837) (21,103) (10,771)
Settlements 5,424 7,572 11,691 12,424
Transfers into Level 3 from Level 2 1,343 (526) 1,725 (4,494)
Transfers from Level 3 into Level 2 (420) 1,305 1,030 4,033
Net derivative balance at end of period (39,542) (40,638) (39,542) (40,638)
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0 $ 0 $ 0