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EMPLOYEE BENEFIT PLANS (Details 2) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Defined Benefit Pension Plan            
Weighted-average assumptions used to determine benefit obligations            
Service cost - benefits earned during the period   $ 2,973   $ 7,928    
Interest cost on projected benefit obligation   2,433   6,488    
Expected return on plan assets   (3,642)   (9,712)    
Total net periodic benefit cost   1,764   4,704    
Contribution made by the company to its defined benefit pension plan for the plan year 2014       $ 1,400    
Defined Benefit Pension Plan | Minimum            
Weighted-average assumptions used to determine benefit obligations            
Adjusted funding target percentage to be maintained       80.00%    
Unfunded Excess Benefits Plan            
Weighted-average assumptions used to determine benefit obligations            
Service cost - benefits earned during the period   333   $ 888    
Interest cost on projected benefit obligation   408   1,088    
Total net periodic benefit cost   $ 741   $ 1,976    
Predecessor | Defined Benefit Pension Plan            
Weighted-average assumptions used to determine benefit obligations            
Discount rate (as a percent) 3.55%          
Service cost - benefits earned during the period $ 974   $ 2,227   $ 6,680 $ 9,411
Interest cost on projected benefit obligation 1,002   2,587   7,761 10,493
Expected return on plan assets (1,293)   (3,065)   (9,194)  
Amortization of prior service cost/(credit) (33)   (98)   (294)  
Amortization of actuarial losses 668   1,576   4,727  
Total net periodic benefit cost 1,318   3,227   9,680  
Contribution made by the company to its defined benefit pension plan for the plan year 2014 $ 2,200          
Predecessor | Unfunded Excess Benefits Plan            
Weighted-average assumptions used to determine benefit obligations            
Discount rate (as a percent) 3.26%          
Service cost - benefits earned during the period $ 95   226   678 954
Interest cost on projected benefit obligation 140   406   1,219 $ 1,696
Amortization of prior service cost/(credit) 1   3   9  
Amortization of actuarial losses 138   321   962  
Total net periodic benefit cost $ 374   $ 956   $ 2,868  
Predecessor | Group life insurance plan            
Weighted-average assumptions used to determine benefit obligations            
Discount rate (as a percent) 3.79%