Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Successor [Member] | Other assets — other notes and accounts receivable
Reserves deducted from asset accounts:
Balance at Beginning of Year	$ 0
Additions (Reductions) Charged to Costs and Expenses	0
Charged to Other Accounts	0
Deductions	0
Balance at End of Year	0	$ 0
Successor [Member] | Current assets — supplies and inventory
Reserves deducted from asset accounts:
Balance at Beginning of Year	0
Additions (Reductions) Charged to Costs and Expenses	0
Charged to Other Accounts	0
Deductions	0
Balance at End of Year	0	0
Successor [Member] | Deferred income taxes
Reserves deducted from asset accounts:
Balance at Beginning of Year	1,033,982
Additions (Reductions) Charged to Costs and Expenses	(7,655)
Charged to Other Accounts	0
Deductions	0
Balance at End of Year	1,026,327	1,033,982
Predecessor [Member] | Other assets — other notes and accounts receivable
Reserves deducted from asset accounts:
Balance at Beginning of Year	0	7,842	$ 159	$ 775
Additions (Reductions) Charged to Costs and Expenses		0	7,683	0
Charged to Other Accounts		0	0	0
Deductions		7,842	0	616
Balance at End of Year		0	7,842	159
Predecessor [Member] | Current assets — supplies and inventory
Reserves deducted from asset accounts:
Balance at Beginning of Year	0	5,991	6,625	8,446
Additions (Reductions) Charged to Costs and Expenses		844	431	580
Charged to Other Accounts		(5,060)	0	(76)
Deductions		1,775	1,065	2,325
Balance at End of Year		0	5,991	6,625
Predecessor [Member] | Deferred income taxes
Reserves deducted from asset accounts:
Balance at Beginning of Year	$ 1,033,982	1,135,399	270,251	43,322
Additions (Reductions) Charged to Costs and Expenses		(101,417)	865,148	226,929
Charged to Other Accounts			0	0
Deductions		0	0	0
Balance at End of Year		$ 1,033,982	$ 1,135,399	$ 270,251