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Pension and Postretirement Benefits - Fair value of the domestic plans' assets by asset class (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | $ 10,872 | $ 10,624
Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 10,655 | 10,401
Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 217 | 223
Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
US Postretirement Benefit Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 520 |
US Postretirement Benefit Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 520 |
US Postretirement Benefit Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
US Postretirement Benefit Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
Foreign Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 11,560 | 12,997
Foreign Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 11,165 | 12,620
Foreign Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 395 | 377
Foreign Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Aggregate fixed income securities | Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 5,966 |
Aggregate fixed income securities | Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 5,966 |
Aggregate fixed income securities | Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
Aggregate fixed income securities | Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
Aggregate fixed income securities | US Postretirement Benefit Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 407 |
Aggregate fixed income securities | US Postretirement Benefit Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 407 |
Aggregate fixed income securities | US Postretirement Benefit Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
Aggregate fixed income securities | US Postretirement Benefit Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
U.S. equity securities | Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4,542 |
U.S. equity securities | Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4,542 |
U.S. equity securities | Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
U.S. equity securities | Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
U.S. equity securities | US Postretirement Benefit Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 109 |
U.S. equity securities | US Postretirement Benefit Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 109 |
U.S. equity securities | US Postretirement Benefit Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
U.S. equity securities | US Postretirement Benefit Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 |
U.S. equity securities | Foreign Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 1,269 | 1,185
U.S. equity securities | Foreign Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 1,269 | 1,185
U.S. equity securities | Foreign Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
U.S. equity securities | Foreign Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Cash | Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 147 | 10,401
Cash | Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 147 | 10,401
Cash | Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Cash | Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Cash | US Postretirement Benefit Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4 | 1,397
Cash | US Postretirement Benefit Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4 | 1,397
Cash | US Postretirement Benefit Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Cash | US Postretirement Benefit Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Equity Securities | Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 217 | 223
Equity Securities | Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Equity Securities | Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 217 | 223
Equity Securities | Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Equity Securities | Foreign Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 336 | 197
Equity Securities | Foreign Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 336 | 197
Equity Securities | Foreign Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Equity Securities | Foreign Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Canadian Fixed Income Securities | Foreign Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 5,174 | 6,744
Canadian Fixed Income Securities | Foreign Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 5,174 | 6,744
Canadian Fixed Income Securities | Foreign Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
Canadian Fixed Income Securities | Foreign Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 0 | 0
International equity securities | Foreign Pension Plans |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4,781 | 4,871
International equity securities | Foreign Pension Plans | Quoted Prices in Active Markets (Level 1) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 4,386 | 4,494
International equity securities | Foreign Pension Plans | Significant Other Observable Inputs (Level 2) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | 395 | 377
International equity securities | Foreign Pension Plans | Significant Unobserved Inputs (Level 3) |  |
Fair value of the domestic plans assets by asset class |  |
Fair value measurement domestic pension plans | $ 0 | $ 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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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