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Employee Retirement Plans - Global Marine Systems Pension Plan - Defined Benefits Section Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined benefit, maximum employees contributions percentage | 6.00% |  |  |
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 |
Global Marine Systems Pension Plan—Defined Benefit Section |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Defined benefit, maximum employees contributions percentage | 5.00% |  |  |
Defined benefit, minimum employees contributions percentage | 8.00% |  |  |
Percentage of pensionable salaries | 9.20% |  |  |
Defined benefit, employer deficit contributions per year | $ 1,400 |  |  |
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 | $ 146,700 |  |  | $ 2,800
Percentage of market value of defined benefit plan assets | 74.00% |  |  | 0.08%
Contributions payable every month during year 2015 to 2018 | $ 500 |  |  |
Contributions payable every month during year 2019 to May 2021 | 600 |  |  |
Contributions payable in June 2021 | $ 100 |  |  |
Percentage of profits after tax before dividends | 10.00% |  |  |
Payment of profits, period | 2 years |  |  |
Percentage of future dividend payable in cash | 50.00% |  |  |

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- Definition Defined contribution plan annual contribution per employee percent. + References No definition available. + Details
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- Definition Defined contribution plan assumptions used calculating benefit obligation consumer prices inflation rate. + References No definition available. + Details
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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 pre retirement rate of return on investments. + References No definition available. + Details
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- Definition Defined contribution plan assumptions used calculating benefit obligation retail price inflation rate. + References No definition available. + Details
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- Definition Defined contribution plan employer deficit contribution per year. + References No definition available. + Details
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- Definition Defined contribution plan fair value of plan assets percentage. + References No definition available. + Details
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- Definition Defined contributions payable every month of second fiscal year to fifth fiscal year. + References No definition available. + Details
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- Definition Defined contributions payable every month of sixth fiscal year to may month of eighth fiscal year. + References No definition available. + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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=58740216&loc=d3e1928-114920 + 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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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