Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Components of the net periodic pension and postretirement benefit cost are as follows:

	Successor						Predecessor
	Three Months Ended September 30, 2018			September 1, 2017 Through September 30, 2017			July 1, 2017 Through August 31, 2017
Service cost	$	117		$	38		$	71
Interest cost	1,225			397			806
Expected return on assets	(1,971		)	(692		)	(1,356		)
Amortization of prior service cost	—			—			33
Amortization of actuarial loss	—			—			110
Net periodic pension and postretirement benefit credit	$	(629	)	$	(257	)	$	(336	)
Contributions paid	$	—		$	213		$	—

	Successor						Predecessor
	Nine Months Ended September 30, 2018			September 1, 2017 Through September 30, 2017			January 1, 2017 Through August 31, 2017
Service cost	$	351		$	38		$	282
Interest cost	3,675			397			3,227
Expected return on assets	(5,913		)	(692		)	(5,425		)
Amortization of prior service cost	—			—			133
Amortization of actuarial loss	—			—			438
Net periodic pension and postretirement benefit credit	$	(1,887	)	$	(257	)	$	(1,345	)
Contributions paid	$	—		$	213		$	356