Workers' Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2017

Compensation Related Costs [Abstract]

Workers' compensation expense

Workers’ compensation expense consists of the following components:

	Successor				Predecessor
	Year Ended December 31, 2017		October 2 through December 31, 2016		January 1 through October 1, 2016		Year Ended December 31, 2015
(In thousands)
Self-insured occupational disease benefits:
Service cost	$	6,320	$	1,583	$	3,465	$	4,282
Interest cost	4,651		1,126		3,184		3,944
Net amortization	—		—		4,325		6,973
Total occupational disease	$	10,971	$	2,709	$	10,974	$	15,199
Traumatic injury claims and assessments	3,208		3,162		6,628		16,781
Total workers’ compensation expense	$	14,179	$	5,871	$	17,602	$	31,980

Schedule of Changes in Occupational Disease Obligations

The table below reconciles changes in the occupational disease liability for the respective period.

	Successor						Predecessor
(In thousands)	Year Ended December 31, 2017			October 2 through December 31, 2016			January 1 through October 1, 2016
Beginning of period	$	111,159		$	119,710		$	90,836
Service cost	6,320			1,583			3,465
Interest cost	4,651			1,126			3,184
Curtailments	(5,433		)	—			4,156
Actuarial (gain) loss	12,242			(9,675		)	—
Benefit and administrative payments	(6,513		)	(1,585		)	(3,728		)
Fresh start accounting adjustment	—			—			21,797
	$	122,426		$	111,159		$	119,710

Schedule of Occupational Disease Obligation Assumptions Used

The following table provides the assumptions used to determine the projected occupational disease obligation:

	Successor		Predecessor
	Year Ended December 31, 2017	October 2 through December 31, 2016	January 1 through October 1, 2016
(Percentages)
Occupational Disease Benefit
Discount rate	3.66	4.31	3.80
Cost escalation rate	N/A	N/A	N/A

Workers' compensation liabilities

Summarized below is information about the amounts recognized in the accompanying consolidated balance sheets for workers’ compensation benefits:

	Year Ended December 31, 2017		Year Ended December 31, 2016
(In thousands)
Occupational disease costs	$	122,426	$	111,159
Traumatic and other workers’ compensation claims	81,191		88,593
Total obligations	203,617		199,752
Less amount included in accrued expenses	18,782		15,184
Noncurrent obligations	$	184,835	$	184,568