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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 1,068 $ 923
Interest cost 962 926
Expected return on plan assets (1,368) (1,279)
Defined Benefit Plan, Actuarial Gain (Loss) (49) (10)
Net periodic benefit cost $ 613 $ 560