PENSIONS AND OTHER BENEFITS - Components of net periodic cost (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Service cost		$ 404	$ 343
Interest cost on benefit obligation	255	358	383
Expected return on plan assets	(258)	(455)	(418)
Amortization of net loss		123	75
Net periodic benefit cost	(3)	430	383
Additional amount recognized due to settlement or curtailment		341
Total recognized in net periodic cost	(3)	771	383
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net actuarial (gain) loss	(1,635)	(2,284)	1,394
Amortization of net loss		(123)	(75)
Total recognized in other comprehensive (income) loss	(1,635)	(2,407)	1,319
Total recognized in net periodic cost and other comprehensive (income) loss	$ (1,638)	$ (1,636)	$ 1,702