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Employee Retirement Plans - Merchant Navy Officers Pension Fund Narrative (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2013 | Mar. 31, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actuarial valuation assumption used, increase in return on investment per year (as a percent) |  |  |  | 4.55% |
Market value of defined benefit plan assets |  |  | $ 170,772 | $ 172,511 | $ 181,877
Merchant Navy Officers Pension Fund |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actuarial valuation assumption used, retail price Inflation rate per year (as a percent) |  |  | 3.10% |  |
Actuarial valuation assumption used, consumer price Inflation rate per year (as a percent) |  |  | 2.10% |  |
Actuarial valuation assumption used, pre-retirement return on investment per year (as a percent) |  |  | 4.75% |  |
Actuarial valuation assumption used, post-retirement return on investment per year (as a percent) |  |  | 2.60% |  |
Expected rate of pensions increase per year (as a percent) |  |  | 2.90% |  |
Market value of defined benefit plan assets |  | $ 3,600,000 |  |  |
Global Marine Systems Pension Plan—Defined Benefit Section |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actuarial valuation assumption used, retail price Inflation rate per year (as a percent) |  |  | 3.70% |  |
Actuarial valuation assumption used, consumer price Inflation rate per year (as a percent) |  |  | 2.70% |  |
Actuarial valuation assumption used, pre-retirement return on investment per year (as a percent) |  |  | 5.50% |  |
Actuarial valuation assumption used, post-retirement return on investment per year (as a percent) |  |  | 4.50% |  |
Actuarial valuation assumption used, increase in return on investment per year (as a percent) |  |  | 3.00% |  |
Market value of defined benefit plan assets |  | $ 2,800 | $ 146,700 |  |
Percentage of market value of defined benefit plan assets |  | 0.08% | 74.00% |  |
Deficit contributions receivable amount |  | $ 394,000 |  |  |
Percentage of accrued service and projected salaries |  | 99.70% |  |  |
Percentage of pensionable salaries | 20.00% |  |  |  |

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- Definition Defined contribution plan assumptions used calculating benefit obligation post retirement rate of return on investments. + References No definition available. + Details
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- Definition Defined contribution plan assumptions used calculating benefit obligation rate of pension increase. + References No definition available. + Details
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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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