EMPLOYEE BENEFIT PLANS - Plan Asset Fair Value (Details) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Successor | Defined Benefit Pension Plan
Fair value hierarchy of Plan's assets
Total investments	$ 201,820,000	$ 196,042,000	$ 196,042,000
Amount transferred into Level 3 from Level 2		0
Amount of transfers between Level 1 and Level 2		0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year		201,820,000
Fair value of plan assets at end of year	201,820,000	196,042,000	196,042,000
Successor | Defined Benefit Pension Plan | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments		3,121,000	$ 3,121,000
Redemption Notice Period			1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		3,121,000	$ 3,121,000
Successor | Defined Benefit Pension Plan | Equity index funds
Fair value hierarchy of Plan's assets
Total investments		125,214,000	125,214,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		125,214,000	125,214,000
Successor | Defined Benefit Pension Plan | Equity securities: Collective Russell 3000 Equity Index Fund
Fair value hierarchy of Plan's assets
Total investments		72,663,000	$ 72,663,000
Redemption Notice Period			1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		72,663,000	$ 72,663,000
Successor | Defined Benefit Pension Plan | Equity securities: Fidelity Spartan 500 Equity Index Fund
Fair value hierarchy of Plan's assets
Total investments		52,551,000	$ 52,551,000
Redemption Notice Period			1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		52,551,000	$ 52,551,000
Successor | Defined Benefit Pension Plan | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments		67,707,000	67,707,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		67,707,000	67,707,000
Successor | Defined Benefit Pension Plan | Level 1
Fair value hierarchy of Plan's assets
Total investments		55,672,000	55,672,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		55,672,000	55,672,000
Successor | Defined Benefit Pension Plan | Level 1 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments		3,121,000	3,121,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		3,121,000	3,121,000
Successor | Defined Benefit Pension Plan | Level 1 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments		52,551,000	52,551,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		52,551,000	52,551,000
Successor | Defined Benefit Pension Plan | Level 1 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Defined Benefit Pension Plan | Level 2
Fair value hierarchy of Plan's assets
Total investments		72,663,000	72,663,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		72,663,000	72,663,000
Successor | Defined Benefit Pension Plan | Level 2 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Defined Benefit Pension Plan | Level 2 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments		72,663,000	72,663,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		72,663,000	72,663,000
Successor | Defined Benefit Pension Plan | Level 2 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Defined Benefit Pension Plan | Level 3
Fair value hierarchy of Plan's assets
Total investments	64,581,000	67,707,000	67,707,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year		64,581,000
Interest income		3,126,000
Transfers from collective short-term investments fund		0
Transfers to collective short-term investments fund		0
Fair value of plan assets at end of year	64,581,000	67,707,000	67,707,000
Successor | Defined Benefit Pension Plan | Level 3 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Defined Benefit Pension Plan | Level 3 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Defined Benefit Pension Plan | Level 3 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments		67,707,000	67,707,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		67,707,000	67,707,000
Successor | Group life insurance plan | Money market fund
Fair value hierarchy of Plan's assets
Total investments		5,653,000	5,653,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Transfers to collective short-term investments fund			0
Fair value of plan assets at end of year		5,653,000	5,653,000
Successor | Group life insurance plan | Level 1 | Money market fund
Fair value hierarchy of Plan's assets
Total investments		5,653,000	5,653,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		5,653,000	5,653,000
Successor | Group life insurance plan | Level 2 | Money market fund
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Successor | Group life insurance plan | Level 3 | Money market fund
Fair value hierarchy of Plan's assets
Total investments		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at end of year		0	0
Predecessor | Defined Benefit Pension Plan
Fair value hierarchy of Plan's assets
Total investments	203,772,000	201,820,000	203,772,000	$ 180,173,000
Amount transferred into Level 3 from Level 2				4,500,000
Amount of transfers between Level 1 and Level 2				0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	203,772,000	201,820,000	203,772,000	180,173,000
Fair value of plan assets at end of year	201,820,000			203,772,000
Predecessor | Defined Benefit Pension Plan | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	7,968,000		7,968,000	$ 7,968,000
Redemption Notice Period				1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	7,968,000		7,968,000
Fair value of plan assets at end of year				$ 7,968,000
Predecessor | Defined Benefit Pension Plan | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	131,508,000		131,508,000	131,508,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	131,508,000		131,508,000
Fair value of plan assets at end of year				131,508,000
Predecessor | Defined Benefit Pension Plan | Equity securities: Collective Russell 3000 Equity Index Fund
Fair value hierarchy of Plan's assets
Total investments	79,660,000		79,660,000	$ 79,660,000
Redemption Notice Period				1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	79,660,000		79,660,000
Fair value of plan assets at end of year				$ 79,660,000
Predecessor | Defined Benefit Pension Plan | Equity securities: Fidelity Spartan 500 Equity Index Fund
Fair value hierarchy of Plan's assets
Total investments	51,848,000		51,848,000	$ 51,848,000
Redemption Notice Period				1 day
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	51,848,000		51,848,000
Fair value of plan assets at end of year				$ 51,848,000
Predecessor | Defined Benefit Pension Plan | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	64,296,000		64,296,000	64,296,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	64,296,000		64,296,000
Fair value of plan assets at end of year				64,296,000
Predecessor | Defined Benefit Pension Plan | Level 1
Fair value hierarchy of Plan's assets
Total investments	59,816,000		59,816,000	59,816,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	59,816,000		59,816,000
Fair value of plan assets at end of year				59,816,000
Predecessor | Defined Benefit Pension Plan | Level 1 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	7,968,000		7,968,000	7,968,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	7,968,000		7,968,000
Fair value of plan assets at end of year				7,968,000
Predecessor | Defined Benefit Pension Plan | Level 1 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	51,848,000		51,848,000	51,848,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	51,848,000		51,848,000
Fair value of plan assets at end of year				51,848,000
Predecessor | Defined Benefit Pension Plan | Level 1 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Defined Benefit Pension Plan | Level 2
Fair value hierarchy of Plan's assets
Total investments	79,660,000		79,660,000	79,660,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	79,660,000		79,660,000
Fair value of plan assets at end of year				79,660,000
Predecessor | Defined Benefit Pension Plan | Level 2 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Defined Benefit Pension Plan | Level 2 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	79,660,000		79,660,000	79,660,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	79,660,000		79,660,000
Fair value of plan assets at end of year				79,660,000
Predecessor | Defined Benefit Pension Plan | Level 2 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Defined Benefit Pension Plan | Level 3
Fair value hierarchy of Plan's assets
Total investments	64,296,000	64,581,000	64,296,000	56,736,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	64,296,000	$ 64,581,000	64,296,000	56,736,000
Interest income	285,000			3,060,000
Transfers from collective short-term investments fund	0			4,500,000
Transfers to collective short-term investments fund	0			0
Fair value of plan assets at end of year	64,581,000			64,296,000
Predecessor | Defined Benefit Pension Plan | Level 3 | Collective short-term investment fund
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Defined Benefit Pension Plan | Level 3 | Equity index funds
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Defined Benefit Pension Plan | Level 3 | Group deposit administration annuity contract
Fair value hierarchy of Plan's assets
Total investments	64,296,000		64,296,000	64,296,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	64,296,000		64,296,000
Fair value of plan assets at end of year				64,296,000
Predecessor | Group life insurance plan | Money market fund
Fair value hierarchy of Plan's assets
Total investments	5,925,000		5,925,000	5,925,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	5,925,000		5,925,000
Transfers to collective short-term investments fund				0
Fair value of plan assets at end of year				5,925,000
Predecessor | Group life insurance plan | Level 1 | Money market fund
Fair value hierarchy of Plan's assets
Total investments	5,925,000		5,925,000	5,925,000
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	5,925,000		5,925,000
Fair value of plan assets at end of year				5,925,000
Predecessor | Group life insurance plan | Level 2 | Money market fund
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	0		0
Fair value of plan assets at end of year				0
Predecessor | Group life insurance plan | Level 3 | Money market fund
Fair value hierarchy of Plan's assets
Total investments	0		0	0
Reconciliation of beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) are used
Fair value of plan assets at beginning of year	$ 0		$ 0
Fair value of plan assets at end of year				$ 0