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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 100   $ 300  
Service cost 1,296 $ 1,118 3,955 $ 3,234
Interest cost 1,026 1,007 3,131 2,915
Expected return on plan assets (1,482) (1,432) (4,522) (4,144)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (11) (51) (35) (149)
Net periodic benefit cost 829 642 2,529 1,856
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Nonoperating Gains (Losses) $ (500) $ (500) $ (1,400) $ (1,400)