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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 100   $ 300  
Service cost 1,158 $ 1,296 3,446 $ 3,955
Interest cost 1,098 1,026 3,267 3,131
Expected return on plan assets (1,433) (1,482) (4,265) (4,522)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (16) (11) (47) (35)
Net periodic benefit cost 807 829 2,401 2,529
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Nonoperating Gains (Losses) $ (400) $ (500) $ (1,000) $ (1,400)