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Pension Benefit and Retirement Health and Life Insurance Benefits (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Pension Benefits |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Noncurrent assets | $ 3,021 | $ 2,583
Current liabilities | (5) | 0
Noncurrent liabilities | (8,720) | (8,501)
Net amount recognized at end of year | (5,704) | (5,918)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Net actuarial (loss) gain | (59,645) | (59,377)
Prior service benefit | 0 | 0
Net amount recognized at end of year | (59,645) | (59,377)
Retirement Health and Life Insurance Benefits |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Noncurrent assets | 0 | 0
Current liabilities | (352) | (512)
Noncurrent liabilities | (1,685) | (1,992)
Net amount recognized at end of year | (2,037) | (2,504)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Net actuarial (loss) gain | 63 | 523
Prior service benefit | 2,821 | 3,878
Net amount recognized at end of year | $ 2,884 | $ 4,401

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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