PENSION AND OTHER BENEFITS - Components of net periodic cost (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 404	$ 343	$ 349
Interest cost on benefit obligation	358	383	361
Expected return on plan assets	(455)	(418)	(397)
Amortization of net loss	123	75	68
Net periodic benefit cost	430	383	381
Additional amount recognized due to settlement or curtailment	341
[OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax]	771	383	381
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income):
Net actuarial loss (gain)	(2,284)	1,394	(23)
Amortization of net loss	(123)	(75)	(68)
Total recognized in other comprehensive income (loss)	(2,407)	1,319	(91)
Total recognized in net periodic cost and other comprehensive income	$ (1,636)	$ 1,702	$ 290