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EMPLOYEE BENEFIT PLANS - Amounts not recognized as components of net periodic pension cost (Details) - Defined Benefit Pension Items [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in accumulated other comprehensive loss consists of:    
Net actuarial loss $ 22,113 $ 18,461
Total $ 22,113 $ 18,461