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Fair Value Measurements - Level 3 Rollforward Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net derivative balance at beginning of period $ (32,979) $ (41,386)
Included in OCI 0 (262)
Deferred as a regulatory asset or liability (9,103) (10,747)
Settlements 1,765 310
Transfers into Level 3 from Level 2 262 (402)
Transfers from Level 3 into Level 2 548 3,673
Net derivative balance at end of period (39,507) (48,814)
Net unrealized gains included in earnings related to instruments still held at end of period $ 0 $ 0