Significant Accounting Policies (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Write-down of oil and natural gas properties	$ 810,921	$ 4,939,600	$ 0
Impairments of unevaluated costs	21,000	17,900
CO2 pipelines not placed in service	100,300
Impairment of goodwill	0	1,261,512	$ 0
Amortization of Intangible Assets	$ 2,300	$ 2,300
Minimum | Pipelines
Significant Accounting Policies [Line Items]
Estimated useful lives	15 years
Minimum | Vehicles and furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Minimum | Computer equipment and software
Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum | Pipelines
Significant Accounting Policies [Line Items]
Estimated useful lives	50 years
Maximum | Vehicles and furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives	10 years
Maximum | Computer equipment and software
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years