Employee Benefit Plans - Assumptions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Ultimate medical trend rate	5.00%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Expected return on plan assets	7.75%
Annual rate of increase in the per capita cost of covered benefits	8.00%
Year that rate reaches ultimate trend rate	2027
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]
Effect of one percentage point increase on accumulated postretirement benefit obligation	234
Effect of one percentage point decrease on accumulated postretirement benefit obligation	(224)
U.S. Pension Plan, Defined Benefit [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.05%	4.90%
Average wage increase	4.00%	4.00%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.90%	4.05%	4.85%
Average wage increase	4.00%	4.00%	4.00%
Expected return on plan assets	7.75%	7.75%	7.75%
Non-U.S. Pension Plans, Defined Benefit [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.31%	3.53%
Average wage increase	2.50%	2.86%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.53%	3.31%	4.62%
Average wage increase	2.86%	2.74%	3.14%
Expected return on plan assets	5.35%	5.32%	5.90%
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.96%	4.77%
Average wage increase	4.50%	4.50%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.77%	4.02%	4.77%
Average wage increase	4.50%	4.50%	4.50%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.75%	4.45%
Ultimate medical trend rate	5.00%	5.00%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.45%	3.65%	3.65%

The interest rate used to adjust for the time value of money for the plan.

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

+ Details

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

+ Details

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ 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 (l)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

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