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Employee Retirement Plans - Summary of Fair Value of Pension Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	$ 170,772	$ 172,511	$ 181,877
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	3,204	2,937	$ 3,104
Global Marine Systems Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	167,567	169,574
Global Marine Systems Pension Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	47,623	49,535
Global Marine Systems Pension Plan | Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	40,635	41,649
Global Marine Systems Pension Plan | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	47,068	44,363
Global Marine Systems Pension Plan | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	24,492	23,193
Global Marine Systems Pension Plan | Property
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	7,544	9,137
Global Marine Systems Pension Plan | Other
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	205	1,697
Global Marine Systems Pension Plan | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	(37)	1,697
Global Marine Systems Pension Plan | Level 1 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	0	0
Global Marine Systems Pension Plan | Level 1 | Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	0	0
Global Marine Systems Pension Plan | Level 1 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	0	0
Global Marine Systems Pension Plan | Level 1 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	0	0
Global Marine Systems Pension Plan | Level 1 | Property
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	0	0
Global Marine Systems Pension Plan | Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	(37)	1,697
Global Marine Systems Pension Plan | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	167,604	167,877
Global Marine Systems Pension Plan | Level 2 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	47,623	49,535
Global Marine Systems Pension Plan | Level 2 | Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	40,635	41,649
Global Marine Systems Pension Plan | Level 2 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	47,068	44,363
Global Marine Systems Pension Plan | Level 2 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	24,492	23,193
Global Marine Systems Pension Plan | Level 2 | Property
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	7,544	9,137
Global Marine Systems Pension Plan | Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	242	0
Merchant Navy Officers Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	3,204	2,937
Merchant Navy Officers Pension Fund | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	525	660
Merchant Navy Officers Pension Fund | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	519	412
Merchant Navy Officers Pension Fund | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	519	675
Merchant Navy Officers Pension Fund | LDI Strategy
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	1,641	1,190
Merchant Navy Officers Pension Fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	3,204	2,937
Merchant Navy Officers Pension Fund | Level 3 | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	525	660
Merchant Navy Officers Pension Fund | Level 3 | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	519	412
Merchant Navy Officers Pension Fund | Level 3 | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	519	675
Merchant Navy Officers Pension Fund | Level 3 | LDI Strategy
Defined Benefit Plan Disclosure [Line Items]
Total Plan Net Assets	$ 1,641	$ 1,190

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

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