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EMPLOYEE BENEFIT PLANS (Details 4) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net periodic pension cost      
Service cost $ 1,557 $ 1,601 $ 1,703
Interest cost 1,341 1,368 1,189
Expected return on plan assets (2,130) (1,991) (1,775)
Amortization of prior year service cost 0 (19) (19)
Amortization of transition asset 0 0 (8)
Special termination benefit liability 0 376 0
Recognized net actuarial loss 1,386 1,181 1,375
Net periodic pension cost $ 2,154 $ 2,516 $ 2,465