Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Bad Debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 0
Charged to Costs and Expenses	369
Charged to Other Accounts	1,858
Deductions	(704)
Balance at End of Period	1,523	$ 0
Predecessor
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 0	2,670	$ 2,032
Charged to Costs and Expenses		1,099	2,850
Charged to Other Accounts		(1,858)	0
Deductions		(1,911)	(2,212)
Balance at End of Period		$ 0	$ 2,670