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Benefit Plans Benefit Plans Post Retirement Medical Plan Accumulated Other Comprehensive Income (Details) (Postretirement Medical Plan [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	$ 39	$ 0
Net actuarial loss (gain)	407	(1)
Total	$ 446	$ (1)

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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