PENSION AND POST-RETIREMENT PLANS (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Employee benefit plans
Number of single-employer defined benefit pension funded plans	2
Qualified Pension Benefits
Employee benefit plans
Target allocation (as a percent)	100.00%
Asset allocations (as a percent)	100.00%	100.00%
One year returns (losses) on plan assets (as a percent)	5.80%
Three year returns (losses) on plan assets (as a percent)	13.80%
Five year returns (losses) on plan assets (as a percent)	10.30%
Long-term average return on plan assets since inception (as a percent)	8.70%
Qualified Pension Benefits | Domestic equity securities
Employee benefit plans
Target allocation (as a percent)	53.00%
Asset allocations (as a percent)	63.00%	58.00%
Qualified Pension Benefits | International equity securities
Employee benefit plans
Target allocation (as a percent)	15.00%
Asset allocations (as a percent)	14.00%	15.00%
Qualified Pension Benefits | Debt securities
Employee benefit plans
Target allocation (as a percent)	22.00%
Asset allocations (as a percent)	17.00%	18.00%
Qualified Pension Benefits | Real estate
Employee benefit plans
Target allocation (as a percent)	5.00%
Asset allocations (as a percent)	5.00%	5.00%
Qualified Pension Benefits | Other and cash
Employee benefit plans
Target allocation (as a percent)	5.00%
Asset allocations (as a percent)	1.00%	4.00%