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Pension and Postretirement Benefits - Fair Value of the Plans' Assets by Asset Class (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 11,590 | $ 10,416
Domestic Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,787 | 5,352
Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,390 | 4,580
Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 214 | 280
Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 199 | 204
Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 9,493 | 10,576
Foreign Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,414 | 4,082
Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,889 | 4,518
Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 190 | 1,976
Quoted Prices in Active Markets (Level 1) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 11,391 | 10,212
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,787 | 5,352
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,390 | 4,580
Quoted Prices in Active Markets (Level 1) | Domestic Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 214 | 280
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 9,070 | 10,188
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,414 | 4,082
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,466 | 4,130
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 190 | 1,976
Significant Other Observable Inputs (Level 2) | Domestic Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 199 | 204
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 199 | 204
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 423 | 388
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 423 | $ 388

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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