Commitments and Contingencies (Details Textual) - USD ($) $ in Millions		4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Apr. 22, 2016	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015
Obligations (Textual)
Building Sub-lease term				3 years 5 months
Operating Leases, Future Minimum Payments Due				$ 2.0
Operating lease commitments [Member]
Obligations (Textual)
Operating Leases, Future Minimum Payments Due				6.2
Operating Leases, Future Minimum Payments Due, Next Twelve Months				4.6
Operating Leases, Future Minimum Payments, Due in Two Years				0.7
Operating Leases, Future Minimum Payments, Due in Three Years				0.6
Operating Leases, Future Minimum Payments, Due in Four Years				0.3
Gas transportation and processing obligations [Member]
Obligations (Textual)
Operating Leases, Future Minimum Payments Due				23.0
Operating Leases, Future Minimum Payments Due, Next Twelve Months				6.8
Operating Leases, Future Minimum Payments, Due in Two Years				8.4
Operating Leases, Future Minimum Payments, Due in Three Years				7.5
Operating Leases, Future Minimum Payments, Due in Four Years				0.3
Building [Member]
Obligations (Textual)
Building Sub-lease term	4 years
Successor [Member]
Obligations (Textual)
Operating Leases, Rent Expense			$ 5.7	$ 4.2
Predecessor [Member]
Obligations (Textual)
Operating Leases, Rent Expense		$ 4.5			$ 16.8