Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

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

	Successor			Predecessor
	September 1, 2017 Through September 30, 2017			July 1, 2017 Through August 31, 2017			Three Months Ended September 30, 2016
Service cost	$	38		$	71		$	112
Interest cost	397			806			1,312
Expected return on assets	(692		)	(1,356		)	(2,035		)
Amortization of prior service cost	—			33			50
Amortization of actuarial loss	—			110			406
Net periodic pension and postretirement benefit (credit) cost	$	(257	)	$	(336	)	$	(155	)
Contributions paid	$	213		$	—		$	—

	Successor			Predecessor
	September 1, 2017 Through September 30, 2017			January 1, 2017 Through August 31, 2017			Nine Months Ended September 30, 2016
Service cost	$	38		$	282		$	336
Interest cost	397			3,227			3,936
Expected return on assets	(692		)	(5,425		)	(6,105		)
Amortization of prior service cost	—			133			150
Amortization of actuarial loss	—			438			1,218
Net periodic pension and postretirement benefit (credit) cost	$	(257	)	$	(1,345	)	$	(465	)
Contributions paid	$	213		$	356		$	—