Retirement and Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Schedule of Reconciliation of Changes in Plans' Benefit Obligations

The following table provides a reconciliation of the changes in the plans’ benefit obligations for the period January 17, 2017 to December 31, 2017 (in thousands):

	Pension Benefits			OPEB
Change in benefit obligation:
Benefit obligation at January 17, 2017	$	562,197		$	22,601
Service cost		-			22
Interest cost		14,981			695
Participant contributions		-			48
Plan settlements		(40,235	)		-
Divestiture transfer		(60,032	)		-
Actuarial gain		11,301			1,431
Benefit payments		(27,350	)		(1,423	)
Benefit obligation at end of year	$	460,862		$	23,374

Schedule of Plans' Benefit Obligations Determined Using Assumptions

The Plans’ benefit obligations were determined using the following assumptions:

	Pension Benefits		OPEB
Discount rate	3.39% to 3.51%		3.30% to 3.53%
Compensation increase rate		-		3.00	%

Schedule of Reconciliation of Changes in Fair Value of Plans' Assets

The following table provides a reconciliation of the changes in the fair value of the Plans’ assets for the for the period January 17, 2017 to December 31, 2017 (in thousands):

	Pension Benefits			OPEB
Change in plan assets:
Fair value of plan assets at beginning of period	$	394,526		$	-
Actual return on plan assets		49,853			-
Employer contributions		4,661			1,375
Participant contributions		-			48
Plan settlements		(40,235	)		-
Benefit payments		(27,350	)		(1,423	)
Fair value of plan assets at end of year	$	381,455		$	-

Schedule of Asset Allocation for Funded Retirement Plan and Range Asset Category

The asset allocation for the Company’s funded retirement plans at the end of 2017, and the asset allocation range for 2018, by asset category, are as follows:

	Asset Allocation	Percentage of Plan Assets at Year End
Asset Category	2018	2017
Equity securities	40%	37%
Fixed income securities/cash	60%	62%
Other		1%
Total		100%

Schedule of Funded Status of Plans

The following table provides a statement of the funded status of the plans at December 31, 2017 (in thousands):

	Pension Benefits			OPEB
Amounts recorded in the balance sheet:
Current liabilities	$	(3,714	)	$	(1,882	)
Noncurrent liabilities		(75,693	)		(21,492	)
Funded status	$	(79,407	)	$	(23,374	)

Summary of Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Postretirement Benefit Plans

The following table provides a summary of the Company’s accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans prior to any deferred tax effects (in thousands):

	Pension Benefits		OPEB
January 17, 2017	$	-	$	-
Actuarial gain (loss)		9,733		(1,433	)
December 31, 2017	$	9,733	$	(1,433	)

Schedule of Expected Plan Contributions

The following table includes amounts that are expected to be contributed to the plans by the Company, in thousands. It additionally reflects benefit payments that are made from the plans’ assets as well as those made directly from the Company’s assets, and it includes the participants’ share of the costs, which is funded by participant contributions. The amounts in the table are actuarially determined and reflect the Company’s best estimate given its current knowledge including the impact of recent pension funding relief legislation.  Actual amounts could be materially different.

	Pension Benefits		OPEB
Employer Contributions
2018 to participant benefits	$	3,714	$	1,882
Expected Benefit Payments
2018	$	29,163	$	1,882
2019		29,904		1,862
2020		29,596		1,839
2021		29,408		1,801
2022		29,155		1,788
2023-2027		142,107		8,271

Summary of Components of Net Periodic Benefit Cost for Plans

The following table provides the components of net periodic benefit cost for the Plans for the period January 17, 2017 to December 31, 2017 (in thousands):

	Pension Benefits			OPEB
Service cost	$	-		$	22
Interest cost		14,981			695
Expected return on plan assets		(27,658	)		-
Settlement gain recognized		(1,160	)		-
Net periodic benefit cost (benefit)	$	(13,837	)	$	717

Schedule of Assumptions Used to Determine Net Periodic Costs

The net periodic costs for the Company’s pension and other benefit plans were determined using the following assumptions:

	Pension Benefits			OPEB
Discount rate		3.87	%		3.80	%
Expected return on plan assets		7.25	%		-
Compensation increase rate		-			3.00	%