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Retirement Agreements and Other Postretirement Benefit Plan Effects on Net Periodic Postretirement Benefit Cost and Accumulated Postretirement Benefit Obligation (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Retirement Benefits [Abstract] |
One-Percent Point Increase: Effect on the service cost component | $ 0
One-Percent Point Increase: Effect on interest cost | 7
One-Percent Point Increase: Total effect on the net periodic postretirement benefit cost | 7
One-Percent Point Decrease: Effect on the service cost component | 0
One-Percent Point Decrease: Effect on interest cost | (5)
One-Percent Point Decrease: Total effect on the net periodic postretirement benefit cost | (5)
One-Percent Point Increase: Effect on those currently receiving benefits (retirees and spouses) | 0
One-Percent Point Increase: Effect on active fully eligible | 176
One-Percent Point Increase: Effect on actives not yet eligible | 0
One-Percent Point Increase: Total effect on the accumulated postretirement benefit obligation | 176
One-Percent Point Decrease: Effect on those currently receiving benefits (retirees and spouses) | 0
One-Percent Point Decrease: Effect on active fully eligible | (139)
One-Percent Point Decrease: Effect on actives not yet eligible | 0
One-Percent Point Decrease: Total effect on the accumulated postretirement benefit obligation | $ (139)

X
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- Definition Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation, Actives Not Yet Eligible + References No definition available. + Details
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- Definition Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation, Currently Receiving Benefits + References No definition available. + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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