EMPLOYEE BENEFIT PLANS - Plan Assets of the Defined Benefit Pension Plan By Category (Details) - Successor - Defined Benefit Pension Plan - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jan. 31, 2015
EMPLOYEE BENEFIT PLANS
Total investments	$ 201,843	$ 196,042	$ 201,820
Employer contribution receivable	0	0
Total	201,843	196,042
Cash and cash equivalents
EMPLOYEE BENEFIT PLANS
Total investments	4,175	3,121
Equity securities: Collective Russell 3000 index fund
EMPLOYEE BENEFIT PLANS
Total investments	67,627	72,663
Equity securities: Fidelity Spartan 500 index fund
EMPLOYEE BENEFIT PLANS
Total investments	58,815	52,551
Fixed income
EMPLOYEE BENEFIT PLANS
Total investments	$ 71,226	$ 67,707