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Pension and Postretirement Benefits - Fair value of the plans' assets by asset class (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 10,479 | $ 11,198
Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,453 | 6,534
Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,459 | 3,855
Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 357 | 552
Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 210 | 257
Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 9,705 | 11,747
Foreign Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 1,012 | 1,236
Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 425 | 451
Foreign Pension Plans | Canadian Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,372 | 5,367
Foreign Pension Plans | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 3,896 | 4,693
Quoted Prices in Active Markets (Level 1) | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 10,269 | 10,941
Quoted Prices in Active Markets (Level 1) | Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 5,453 | 6,534
Quoted Prices in Active Markets (Level 1) | Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,459 | 3,855
Quoted Prices in Active Markets (Level 1) | Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 357 | 552
Quoted Prices in Active Markets (Level 1) | Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 9,330 | 11,327
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 1,012 | 1,236
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 425 | 451
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | Canadian Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 4,372 | 5,367
Quoted Prices in Active Markets (Level 1) | Foreign Pension Plans | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 3,521 | 4,273
Significant Other Observable Inputs (Level 2) | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 210 | 257
Significant Other Observable Inputs (Level 2) | Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 210 | 257
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 375 | 420
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | Canadian Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Other Observable Inputs (Level 2) | Foreign Pension Plans | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 375 | 420
Significant Unobserved Inputs (Level 3) | Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Pension Plans | Aggregate fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Foreign Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Foreign Pension Plans | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Foreign Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | 0
Significant Unobserved Inputs (Level 3) | Foreign Pension Plans | Canadian Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | 0 | $ 0
Significant Unobserved Inputs (Level 3) | Foreign Pension Plans | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value measurement domestic pension plans | $ 0 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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