PENSIONS - Reconciliation of Funded Status (Details) - Pensions - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of funded status:
Projected benefit obligation	$ (51,171)	$ (50,376)	$ (49,473)
Fair value of plan assets	13,634	12,503	$ 13,194
Funded (unfunded) status at end of year	(37,537)	(37,873)
Equity securities
Reconciliation of funded status:
Fair value of plan assets	9,921	8,936
Debt securities
Reconciliation of funded status:
Fair value of plan assets	3,047	2,860
Cash
Reconciliation of funded status:
Fair value of plan assets	666	707
UK Scheme
Reconciliation of funded status:
Projected benefit obligation	(11,654)	(10,461)
Fair value of plan assets	12,968	10,651
Funded (unfunded) status at end of year	1,314	190
Marine Scheme
Reconciliation of funded status:
Projected benefit obligation	(39,517)	(39,915)
Fair value of plan assets	666	1,852
Funded (unfunded) status at end of year	$ (38,851)	$ (38,063)

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

+ Details

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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- References

No definition available.

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