XML 35 R104.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
EMPLOYEE BENEFIT PLANS - Weighted-average assumptions used to determine benefit obligations (Details)
Dec. 31, 2019
Dec. 31, 2018
WEIGHTED AVERAGE ASSUMPTIONS:    
Discount rate 3.20% 4.28%
Salary scale 2.50% 2.50%