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Employee Retirement Plans - Global Marine Systems (Guernsey) Pension Plan (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) contribution | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined contribution section employees contribution (as a percent) | 50.00% |  |
Market value of defined benefit plan assets | $ 170,772 | $ 181,877 | $ 172,511
Global Marine Systems (Guernsey) Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Actuarial valuation assumption used, pre-retirement return on investment per year (as a percent) | 5.30% |  |
Actuarial valuation assumption used, post-retirement return on investment per year (as a percent) | 4.40% |  |
Inflation rate percentage | 3.70% |  |
Expected rate of pensions increase per year (as a percent) | 3.30% |  |
Market value of defined benefit plan assets |  | 3,000 |
Amount of past service shortfall |  | $ 200 |
Percentage of funding ratio |  | 93.00% |
Number of annual contributions | contribution | 7 |  |
Amount of annual contributions | $ 100 |  |
Global Marine Systems (Guernsey) Pension Plan | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined benefit, minimum employees contributions percentage | 5.00% |  |
Defined contribution section employees contribution (as a percent) | 2.00% |  |
Global Marine Systems (Guernsey) Pension Plan | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined benefit, minimum employees contributions percentage | 8.00% |  |
Defined contribution section employees contribution (as a percent) | 7.50% |  |

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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 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 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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- Definition The amount of increase or decrease in the fair value of plan assets during the reporting period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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