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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Amortization of pension and other postretirement benefit plan items: |  |
Total net of tax | $ 1,567 | $ 6,336
Settlement gain [Member] |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | (8) |
Actuarial losses [Member] |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | 2,597 |
Prior service credit [Member] |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | (41) |
Pension and Other Postretirement Benefit Plans [Member] |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | 2,548 |
Tax benefit | (981) |
Total net of tax | $ 1,567 | $ 6,336

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: 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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