1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Projected Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6522206

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Postretirement Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503904

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 30
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Employee Retirement Plans - Summary of GMSL's Investments Plan (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	$ 170,772	$ 172,511	$ 181,877
Present value of liabilities	(192,599)	(197,600)	$ (219,087)
Net pension asset (liability)	(21,827)
Global Marine Systems Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	167,567	169,574
Global Marine Systems Pension Plan \| Equities
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	47,623	49,535
Global Marine Systems Pension Plan \| Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	40,635	41,649
Global Marine Systems Pension Plan \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	47,068	44,363
Global Marine Systems Pension Plan \| Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	24,492	23,193
Global Marine Systems Pension Plan \| Property
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	7,544	9,137
Global Marine Systems Pension Plan \| Other
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	205	1,697
Merchant Navy Officers Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	3,204	2,937
Merchant Navy Officers Pension Fund \| Equities
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	525	660
Merchant Navy Officers Pension Fund \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	519	412
Merchant Navy Officers Pension Fund \| Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	519	675
Marine Services \| Global Marine Systems Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	167,567	169,574
Present value of liabilities	(189,586)	(194,730)
Net pension asset (liability)	(22,019)	(25,156)
Marine Services \| Global Marine Systems Pension Plan \| Equities
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	47,623	49,535
Marine Services \| Global Marine Systems Pension Plan \| Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	40,635	41,649
Marine Services \| Global Marine Systems Pension Plan \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	47,068	44,363
Marine Services \| Global Marine Systems Pension Plan \| Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	24,492	23,193
Marine Services \| Global Marine Systems Pension Plan \| Property
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	7,544	9,137
Marine Services \| Global Marine Systems Pension Plan \| Other
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	205	1,697
Marine Services \| Merchant Navy Officers Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	3,205	2,937
Present value of liabilities	(3,013)	(2,869)
Net pension asset (liability)	192	68
Marine Services \| Merchant Navy Officers Pension Fund \| Equities
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	526	660
Marine Services \| Merchant Navy Officers Pension Fund \| Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	1,641	1,190
Marine Services \| Merchant Navy Officers Pension Fund \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	519	412
Marine Services \| Merchant Navy Officers Pension Fund \| Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Total market value of assets	$ 519	$ 675