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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

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Significant Accounting Policies (Details Textuals) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Ceiling test write-down	$ 0	$ 0	$ 0
Impairment of Goodwill	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Amortization of Intangible Assets	$ 2,300,000us-gaap_AmortizationOfIntangibleAssets	$ 1,300,000us-gaap_AmortizationOfIntangibleAssets
Antidilutive Securities Excluded from Computation of Earnings Per Share, Total	4.8	3.6	4.1
Minimum [Member] \| Co2 Property And Pipelines [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	15 years
Minimum [Member] \| Riley Ridge gas processing facility [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	20 years
Minimum [Member] \| Vehicles and furniture and fixtures [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Minimum [Member] \| Computer equipment and software [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum [Member] \| Co2 Property And Pipelines [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	50 years
Maximum [Member] \| Riley Ridge gas processing facility [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	50 years
Maximum [Member] \| Vehicles and furniture and fixtures [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	10 years
Maximum [Member] \| Computer equipment and software [Member]
Significant Accounting Policies [Line Items]
Estimated useful lives	5 years