EMPLOYEE BENEFITS - Assumptions Used in Determining Actuarial Present Value of Benefit Obligations and Net Periodic Benefit Cost (Details)	4 Months Ended		8 Months Ended		12 Months Ended
	Dec. 31, 2014		Aug. 31, 2014		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assumptions for benefit obligations
Expected long-term rate of return on plan assets	7.50%				7.50%	7.50%	7.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Expected long-term rate of return on plan assets					7.50%	7.50%	7.50%
Qualified Plan
Assumptions for benefit obligations
Discount rate	4.125%				4.64%	4.125%	5.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.25%	[1]	5.00%	[1]	4.125%		4.125%
Non-Qualified Plan
Assumptions for benefit obligations
Discount rate	3.875%				4.54%	3.875%	4.75%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.00%	[2]	4.75%	[2]	3.875%		4.00%

[1] 5.00% for January 1 - August 31, 2014 period; 4.25% for September 1 - December 31, 2014 period.

[2] 4.75% for January 1 - August 31, 2014 period; 4.00% for September 1 - December 31, 2014 period.