Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Summary of Contribution Expense

Our contribution expense was as follows:

	Successor		Predecessor
	Period from		Period from
	March 22, 2017		January 1, 2017
	through		through		Year ended December 31,
	December 31, 2017		March 21, 2017		2016		2015
401(k) contribution expense	$	1,267	$	396	$	1,781	$	2,363