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EMPLOYEE BENEFIT PLANS - Projected benefit obligation and net benefit cost (Details) (Retirement Income Plan)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Retirement Income Plan
     
PROJECTED BENEFIT OBLIGATION:      
Discount rate 5.35% 4.34% 5.09%
Rate of compensation increase         
NET BENEFIT COST:      
Discount rate 4.34% 5.09% 5.58%
Expected return on plan assets 7.00% 7.00% 7.00%
Rate of compensation increase