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

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.

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

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- References

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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

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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

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