Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Weighted-Average Assumptions (Details)

v3.8.0.1
EMPLOYEE BENEFIT PLANS - Weighted-Average Assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ACCUMULATED BENEFIT OBLIGATION      
Discount rate 4.00% 4.45% 4.70%
NET BENEFIT COST      
Discount rate 4.45% 4.70% 4.15%
Expected return on plan assets 7.00% 7.00% 7.00%