Recently Issued Accounting Pronouncements	12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Leases. In February 2016, the FASB issued Accounting Standards Update ("ASU") 2016-02, Leases ("ASU 2016-02"). The standard requires lessees to recognize a right of use asset ("ROU asset") and lease liability on the balance sheet for the rights and obligations created by leases. ASU 2016-02 also requires disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements ("ASU 2018-11"), which provides for an alternative transition method by allowing entities to initially apply the new leases standard at the adoption date, January 1, 2019, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Comparative periods presented in the financial statements will continue to be in accordance with ASC Topic 840, Leases. The standard is effective for annual and interim periods beginning after December 15, 2018, with earlier application permitted. In the normal course of business, the Company enters into lease agreements to support its exploration and development operations and lease assets, such as drilling rigs, field services and well equipment, office space and other assets. The Company adopted the new standard on the effective date of January 1, 2019, using a modified retrospective approach as permitted under ASU 2018-11. The new standard provides a number of optional practical expedients in transition. The Company expects to: • elect the package of 'practical expedients', which permits the Company not to reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs; • elect the practical expedient pertaining to land easements and plan to account for existing land easements under the Company's current accounting policy; • elect the short-term lease recognition exemption for all leases that qualify and, as such, no ROU asset or lease liability will be recorded on the balance sheet and no transition adjustment will be required for short-term leases; and • elect the practical expedient to not separate lease and non-lease components for all of the Company's leases. The Company does not expect to elect the hindsight practical expedient in determining the lease term and assessing impairment of ROU assets when transitioning to ASU 2016-02. The Company estimates the most significant impact, if any, will relate to the recognition of new ROU assets and lease liabilities on its balance sheet for operating leases, as well as additional disclosures. Consequently, with adoption, the Company expects to recognize additional operating liabilities of less than $1 million with corresponding ROU assets. Revenue Recognition. Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue From Contracts with Customers ("ASU 2014-09"), using the modified retrospective method. Under the modified retrospective method, the Company recognized the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of accumulated deficit; however, no adjustment was required as a result of adopting the new standard. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606. The comparative information has not been restated and continues to be reported under historic accounting standards in effect for those periods. The impact of the adoption of ASU 2014-09 was, and is expected to be, immaterial to the Company’s net income on an ongoing basis. See Note 5. Revenue Recognition, for further discussion.

Recently Issued Accounting Pronouncements

Leases. In February 2016, the FASB issued Accounting Standards Update ("ASU") 2016-02, Leases ("ASU 2016-02"). The standard requires lessees to recognize a right of use asset ("ROU asset") and lease liability on the balance sheet for the rights and obligations created by leases. ASU 2016-02 also requires disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements ("ASU 2018-11"), which provides for an alternative transition method by allowing entities to initially apply the new leases standard at the adoption date, January 1, 2019, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Comparative periods presented in the financial statements will continue to be in accordance with ASC Topic 840, Leases. The standard is effective for annual and interim periods beginning after December 15, 2018, with earlier application permitted.

In the normal course of business, the Company enters into lease agreements to support its exploration and development operations and lease assets, such as drilling rigs, field services and well equipment, office space and other assets. The Company adopted the new standard on the effective date of January 1, 2019, using a modified retrospective approach as permitted under ASU 2018-11.

The new standard provides a number of optional practical expedients in transition. The Company expects to:

• elect the package of 'practical expedients', which permits the Company not to reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs;

• elect the practical expedient pertaining to land easements and plan to account for existing land easements under the Company's current accounting policy;

• elect the short-term lease recognition exemption for all leases that qualify and, as such, no ROU asset or lease liability will be recorded on the balance sheet and no transition adjustment will be required for short-term leases; and

• elect the practical expedient to not separate lease and non-lease components for all of the Company's leases.

The Company does not expect to elect the hindsight practical expedient in determining the lease term and assessing impairment of ROU assets when transitioning to ASU 2016-02.

The Company estimates the most significant impact, if any, will relate to the recognition of new ROU assets and lease liabilities on its balance sheet for operating leases, as well as additional disclosures. Consequently, with adoption, the Company expects to recognize additional operating liabilities of less than $1 million with corresponding ROU assets.

Revenue Recognition. Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue From Contracts with Customers ("ASU 2014-09"), using the modified retrospective method. Under the modified retrospective method, the Company recognized the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of accumulated deficit; however, no adjustment was required as a result of adopting the new standard. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606. The comparative information has not been restated and continues to be reported under historic accounting standards in effect for those periods. The impact of the adoption of ASU 2014-09 was, and is expected to be, immaterial to the Company’s net income on an ongoing basis. See Note 5. Revenue Recognition, for further discussion.