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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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Defined contribution plan assumptions used calculating benefit obligation consumer prices inflation rate.

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Defined contribution plan assumptions used calculating benefit obligation post retirement rate of return on investments.

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Defined contribution plan assumptions used calculating benefit obligation pre retirement rate of return on investments.

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Defined contribution plan assumptions used calculating benefit obligation retail price inflation rate.

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Defined contribution plan employer deficit contribution per year.

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Defined contribution plan fair value of plan assets percentage.

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Defined Contribution Plan, Payment of Profits, Period

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Defined contributions payable every month of second fiscal year to fifth fiscal year.

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Defined contributions payable every month of sixth fiscal year to may month of eighth fiscal year.

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Defined contributions payable in june month of eighth fiscal year.

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Percentage of future dividend payable in cash.

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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

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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
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-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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