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Pension and Postretirement Benefits - Accumulated benefit obligation in excess of plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Domestic Pension Plans | Funded Plans |  |  |
Accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | $ 14,906 | $ 16,012 |
Accumulated benefit obligation | 14,906 | 16,012 |
Fair value of plan assets | 10,479 | 11,200 |
Domestic Pension Plans | Unfunded Pension Plans |  |  |
Accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 10,049 |  | $ 11,127
Accumulated benefit obligation | 9,934 |  | 11,014
Fair value of plan assets | 0 |  | $ 0
Foreign Plans | Funded Plans |  |  |
Accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 9,744 | 12,016 |
Accumulated benefit obligation | 9,186 | 11,268 |
Fair value of plan assets | 9,705 | 11,747 |
Foreign Plans | Unfunded Pension Plans |  |  |
Accumulated benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 2,470 | 2,756 |
Accumulated benefit obligation | 2,470 | 2,656 |
Fair value of plan assets | $ 0 | $ 0 |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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