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Pension and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 13,900 | $ 13,500 | $ 12,600
Accumulated benefit obligation | 269,200 | 253,900 |
Project benefit obligation for the pension plans with an accumulated benefit obligation in excess of plan assets | 215,600 | 205,800 |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation in excess of assets | 212,700 | 203,100 |
Fair value of plan assets for the pension plans with an accumulated benefit obligations in excess of plan assets | 138,500 | 128,500 |
Projected benefit obligation of plan assets | 56,500 | 50,700 |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation less than plan assets | 56,500 | 50,700 |
Fair value of plan assets for the pension plans with an accumulated benefit obligations less than plan assets | $ 59,600 | 53,900 |
Target asset allocation for the investment of the assets in fixed income securities minimum | 75.00% |  |
Target asset allocation for the investment of the assets in fixed income securities maximum | 80.00% |  |
Target asset allocation for the investment of the assets in equity securities minimum | 20.00% |  |
Target asset allocation for the investment of the assets in equity securities maximum | 25.00% |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 30.00% |  |
Target asset allocation for the investment of the assets in equity securities | 60.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 40.00% |  |
Target asset allocation for the investment of the assets in equity securities | 70.00% |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement loss (gain) | $ (8) | 7,630 | 128
Pension and other postretirement plans | 4,600 |  |
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement loss (gain) | 0 | $ 0 | $ 0
Pension and other postretirement plans | $ 1,600 |  |

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- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate accumulated benefit obligation. + References No definition available. + Details
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- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate fair value of plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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