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Employee Benefit Plans (Weighted-average Assumptions Used) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits [Member] |  |  |
Weighted-average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 3.66% | 4.17% |
Rate of compensation increase | 4.23% | 4.23% |
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate - service cost | 3.96% | 4.30% | 3.97%
Discount rate - interest cost | 3.51% | 3.76% | 3.97%
Expected long-term return on plan assets | 7.50% | 7.50% | 7.50%
Rate of compensation increase | 4.23% | 4.23% | 4.23%
Other Benefits [Member] |  |  |
Weighted-average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 3.25% | 3.50% |
Rate of compensation increase | 0.00% | 0.00% |
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate - service cost | 4.61% | 4.95% | 3.23%
Discount rate - interest cost | 2.56% | 2.49% | 3.23%
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%
Rate of compensation increase | 0.00% | 0.00% | 0.00%
Foreign Plan [Member] |  |  |
Weighted-average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 2.58% | 2.83% |
Rate of compensation increase | 3.63% | 3.78% |
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: |  |  |
Discount rate - service cost | 1.34% | 2.04% | 4.12%
Discount rate - interest cost | 2.75% | 3.45% | 4.12%
Expected long-term return on plan assets | 4.40% | 4.87% | 5.22%
Rate of compensation increase | 3.78% | 3.70% | 3.48%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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