Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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			Successor			Predecessor
	Three Months Ended June 30, 2018			Three Months Ended June 30, 2017			Six Months Ended June 30, 2018			Six Months Ended June 30, 2017
Service cost	$	117		$	105		$	234		$	211
Interest cost	1,225			1,211			2,450			2,421
Expected return on assets	(1,971		)	(2,035		)	(3,942		)	(4,069		)
Amortization of prior service cost	—			50			—			100
Amortization of actuarial loss	—			164			—			328
Net periodic pension and postretirement benefit gain	$	(629	)	$	(505	)	$	(1,258	)	$	(1,009	)
Contributions paid	$	—		$	—		$	—		$	356