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PENSIONS - Reconciliation of Benefit Obligation (Details) - Pensions - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of benefit obligation:
Benefit obligation at January 1	$ 51,171	$ 50,376
Service cost	250	313	$ 302
Interest cost	1,687	1,901	2,051
Actuarial (gain)/ loss	(3,265)	873
Foreign currency exchange rate changes	(599)	1,008
Benefit payments	(3,151)	(3,300)
Benefit obligation at December 31	46,093	51,171	$ 50,376
Accumulated benefit obligation	$ 45,300	$ 50,200

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- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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