Basis of Presentation (Plan of Reorganization) (Details Textuals) - Subsequent Event $ in Thousands	Aug. 04, 2020 USD ($)	Jul. 29, 2020 USD ($) D	Aug. 07, 2020 USD ($)	Jul. 28, 2020
Plan Of Chapter 11 Reorganization [Line Items]
Outstanding borrowings under debtor-in-possession facility	$ 185,000
Cash repayments of outstanding borrowings on debtor in possession facility	150,000
Letters of credit outstanding under DIP Facility	$ 95,000
Interest paid to second lien noteholders		$ 8,000
Days After Petition Date | D		35
Days After Entry of the Confirmation Order | D		14
Lenders Under Credit Facility
Plan Of Chapter 11 Reorganization [Line Items]
Consenting percentage				100.00%
Second Lien Note Holders
Plan Of Chapter 11 Reorganization [Line Items]
Consenting percentage				67.10%
Equity percentage under plan of reorganization		95.00%
Convertible Note Holders
Plan Of Chapter 11 Reorganization [Line Items]
Consenting percentage				73.10%
Equity percentage under plan of reorganization		5.00%
Convertible Note Holders | Series A Warrants
Plan Of Chapter 11 Reorganization [Line Items]
Percentage of warrants		100.00%
Subordinated Note Holders
Plan Of Chapter 11 Reorganization [Line Items]
Equity percentage under plan of reorganization		3.00%
Subordinated Note Holders | Series B Warrants
Plan Of Chapter 11 Reorganization [Line Items]
Percentage of warrants		54.55%
Equity Holders
Plan Of Chapter 11 Reorganization [Line Items]
Equity percentage under plan of reorganization		2.50%
Equity Holders | Series B Warrants
Plan Of Chapter 11 Reorganization [Line Items]
Percentage of warrants		45.45%
NEJD Pipeline Lease Financing
Plan Of Chapter 11 Reorganization [Line Items]
Letters of credit outstanding under DIP Facility			$ 41,300