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Retirement Plans, Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Increase | $ 0 | $ 0 |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Decrease | 0 | 0 |
SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Increase | 0 | 0 |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Decrease | 0 | 0 |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Increase | 74 | 107 |
Effect of one-percentage-point change in assumed health care cost trend rate on postretirement obligation, Decrease | (64) | (93) |
Effect of one-percentage-point change in assumed health care cost trend rate on aggregate service and interest cost, Increase | 4 | 5 | $ 7
Effect of one-percentage-point change in assumed health care cost trend rate on aggregate service and interest cost, Decrease | $ (3) | $ (4) | $ (6)

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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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