Investments in Affiliates	3 Months Ended
Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Affiliates	Note 6 – Investments in Affiliates Carbon Appalachia For the period April 3, 2017 (inception) through December 31, 2018, based on our 27.24% combined Class A, Class B and Class C interest (and our ability as of December 31, 2018 to earn up to an additional 14.7%) in Carbon Appalachia, our ability to appoint a member to the board of directors and our role of manager of Carbon Appalachia, we accounted for our investment in Carbon Appalachia under the equity method of accounting as we believed we exerted significant influence. We used the HLBV to determine our share of profits or losses in Carbon Appalachia and adjusted the carrying value of our investment accordingly. Our investment in Carbon Appalachia is represented by our Class A and C interests, which we acquired by contributing approximately $6.9 million in cash and unevaluated property. In the event of liquidation of Carbon Appalachia, available proceeds are first distributed to members holding Class C Units then to holders of Class A Units until their contributed capital is recovered with an internal rate of return of 10%. Any additional distributions would then be shared between holders of Class A, Class B and Class C Units. On December 31, 2018, we acquired all of Old Ironsides’ Class A Units of Carbon Appalachia for approximately $58.1 million, subject to customary and standard closing adjustments. We paid $ 33.0 million in cash and issued the Old Ironsides Notes in the aggregate original principal amount of approximately $25.1 million to Old Ironsides. Effective December 31, 2018, upon the closing of the OlE Membership Acquisition, we consolidate Carbon Appalachia in our consolidated financial statements. Carbon California For the period February 15, 2017 (inception) through January 31, 2018, based on our 17.81% interest in Carbon California, our ability to appoint a member to the board of directors and our role of manager of Carbon California, we accounted for our investment in Carbon California under the equity method of accounting as we believed we exerted significant influence. We used the Hypothetical Liquidation at Book Value Method (“*HLBV”) to determine our share of profits or losses in Carbon California and adjusted the carrying value of our investment accordingly. The HLBV is a balance-sheet approach that calculates the amount each member of Carbon California would have received if Carbon California were liquidated at book value at the end of each measurement period. The change in the allocated amount to each member during the period represents the income or loss allocated to that member. In the event of liquidation of Carbon California, to the extent that Carbon California has net income, available proceeds are first distributed to members holding Class B Units and any remaining proceeds are then distributed to members holding Class A Units. Effective February 1, 2018, upon the exercise of the California Warrant, we consolidate Carbon California in our consolidated financial statements. Other Affiliates* At March 31, 2019 and December 31, 2018, we retained interests in two equity method investments associated with the development and transportation of oil and gas.

Investments in Affiliates

3 Months Ended

Mar. 31, 2019

Equity Method Investments and Joint Ventures [Abstract]

Note 6 – Investments in Affiliates

Carbon Appalachia

For the period April 3, 2017 (inception) through December 31, 2018, based on our 27.24% combined Class A, Class B and Class C interest (and our ability as of December 31, 2018 to earn up to an additional 14.7%) in Carbon Appalachia, our ability to appoint a member to the board of directors and our role of manager of Carbon Appalachia, we accounted for our investment in Carbon Appalachia under the equity method of accounting as we believed we exerted significant influence. We used the HLBV to determine our share of profits or losses in Carbon Appalachia and adjusted the carrying value of our investment accordingly. Our investment in Carbon Appalachia is represented by our Class A and C interests, which we acquired by contributing approximately $6.9 million in cash and unevaluated property. In the event of liquidation of Carbon Appalachia, available proceeds are first distributed to members holding Class C Units then to holders of Class A Units until their contributed capital is recovered with an internal rate of return of 10%. Any additional distributions would then be shared between holders of Class A, Class B and Class C Units.

On December 31, 2018, we acquired all of Old Ironsides’ Class A Units of Carbon Appalachia for approximately $58.1 million, subject to customary and standard closing adjustments. We paid $ 33.0 million in cash and issued the Old Ironsides Notes in the aggregate original principal amount of approximately $25.1 million to Old Ironsides.

Effective December 31, 2018, upon the closing of the OlE Membership Acquisition, we consolidate Carbon Appalachia in our consolidated financial statements.

Carbon California

For the period February 15, 2017 (inception) through January 31, 2018, based on our 17.81% interest in Carbon California, our ability to appoint a member to the board of directors and our role of manager of Carbon California, we accounted for our investment in Carbon California under the equity method of accounting as we believed we exerted significant influence. We used the Hypothetical Liquidation at Book Value Method (“HLBV”) to determine our share of profits or losses in Carbon California and adjusted the carrying value of our investment accordingly. The HLBV is a balance-sheet approach that calculates the amount each member of Carbon California would have received if Carbon California were liquidated at book value at the end of each measurement period. The change in the allocated amount to each member during the period represents the income or loss allocated to that member. In the event of liquidation of Carbon California, to the extent that Carbon California has net income, available proceeds are first distributed to members holding Class B Units and any remaining proceeds are then distributed to members holding Class A Units.

Effective February 1, 2018, upon the exercise of the California Warrant, we consolidate Carbon California in our consolidated financial statements.

Other Affiliates

At March 31, 2019 and December 31, 2018, we retained interests in two equity method investments associated with the development and transportation of oil and gas.