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Benefit Plans - Other Post-Retirement Benefits (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2015 USD ($) age
Schedule of Defined Benefit Plans and Defined Contribution Plans Disclosures [Line Items] |  |  |
Post-retirement medical, maximum age of coverage | age |  |  | 65
Post-retirement medical, minimum service requirement |  |  | 5 years
Post-retirement medical, minimum age of coverage | age |  |  | 55
Post-retirement medical, post 55, pre 2006 employee percentage of monthly insurance |  |  | 20.00%
Post-retirement medical, post 55, post 2006 employee percentage of monthly insurance |  |  | 100.00%
Post-retirement medical, post 2006 reduction in premium service requirement |  |  | 10 years
Post-retirement medical, post 55 with post 2006 reduction in premium service requirement percentage of monthly insurance |  |  | 50.00%
Weighted-average discount rates used to determine the benefit obligations | 4.20% | 3.65% |
Weighted average discount rate use to determine net periodic benefit costs | 3.80% | 4.20% | 3.50%
Postretirement Medical Plan |  |  |
Schedule of Defined Benefit Plans and Defined Contribution Plans Disclosures [Line Items] |  |  |
Plan termination | $ |  |  | $ 6,632
Defined benefit gain on plan termination | $ |  |  | $ (5,600)

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