Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Oil and gas properties:
Accumulated depreciation, depletion, amortization and impairment	$ (98,604)	$ (80,715)
Net oil and gas properties	253,871	36,125
Pipeline Facilities Equipment	12,714
Base Gas Amount	2,122
Furniture and fixtures, computer hardware and software, and other equipment	6,649	1,758
Accumulated depreciation and amortization	(3,922)	(1,021)
Net other property and equipment	17,563	737
Total property and equipment, net	271,434	36,862
Proved oil and gas properties [Member]
Oil and gas properties:
Oil and gas properties, gross	337,660	114,893
Unproved properties not subject to depletion [Member]
Oil and gas properties:
Oil and gas properties, gross	$ 5,416	$ 1,947