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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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- 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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