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EMPLOYEE BENEFIT PLANS - Principal Actuarial Assumptions(Details) - Pension Plans
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation, discount rate 3.98% 4.17%
Net periodic pension cost, discount rate 4.17% 3.82%
Net periodic pension cost, long term rate of return on plan assets 7.00% 8.00%