PENSION PLANS AND OTHER POST-RETIREMENT BENEFITS - Assumptions Used to Calculate Net Periodic Cost and Benefit Obligations (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Assumptions used to calculate benefit obligations [Abstract]
Weighted average rate of future compensation increase	2.92%
Pension Plans
Assumptions used to calculate net periodic cost [Abstract]
Weighted average discount rate		3.63%	4.52%
Expected long-term rate of return on plan assets		7.00%	7.00%
Weighted average rate of future compensation increase	2.92%	3.71%	3.59%
Assumptions used to calculate benefit obligations [Abstract]
Weighted average discount rate		4.30%
Weighted average rate of future compensation increase		3.60%
Postretirement Plans
Assumptions used to calculate net periodic cost [Abstract]
Weighted average discount rate	4.25%	4.26%	4.95%
Expected long-term rate of return on plan assets		7.00%	7.00%
Assumptions used to calculate benefit obligations [Abstract]
Weighted average discount rate	4.40%	5.00%
Minimum | Pension Plans
Assumptions used to calculate net periodic cost [Abstract]
Weighted average discount rate	4.00%
Expected long-term rate of return on plan assets	7.00%
Minimum | Postretirement Plans
Assumptions used to calculate net periodic cost [Abstract]
Expected long-term rate of return on plan assets	4.75%
Assumptions used to calculate benefit obligations [Abstract]
Weighted average discount rate	4.15%
Maximum | Pension Plans
Assumptions used to calculate net periodic cost [Abstract]
Weighted average discount rate	4.05%
Expected long-term rate of return on plan assets	7.25%
Maximum | Postretirement Plans
Assumptions used to calculate net periodic cost [Abstract]
Expected long-term rate of return on plan assets	7.25%
Assumptions used to calculate benefit obligations [Abstract]
Weighted average discount rate	4.25%