Significant Customers and Other Concentrations	12 Months Ended
Dec. 31, 2018
Text Block [Abstract]
Significant Customers and Other Concentrations	Significant Customers and Other Concentrations Significant Customers. During 2018, four customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. During 2017, three customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. During 2016, three customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. Collectability is dependent upon the financial stability of each individual company and is influenced by the general economic conditions of the industry. The Company normally sells production to a relatively small number of customers, as is customary in the development and production business. The Company sells natural gas and related NGLs to two primary gas gathering and processing companies. Based on where the Company operates and the availability of other purchasers and markets, the Company believes that its production could be sold in the market in the event that it is not sold to its existing customers. However, in some circumstances, a change in customers may entail significant costs during the transition to a new customer. Concentrations of Market Risk. The future results of the Company's oil and gas operations will be affected by the market prices of oil, natural gas and NGLs. A readily available market for oil, natural gas and NGLs in the future will depend on numerous factors beyond the control of the Company, including weather, imports, marketing of competitive fuels, proximity and capacity of oil and gas pipelines and other transportation facilities, any oversupply or undersupply of oil, gas and NGLs, the regulatory environment, the economic environment and other regional, national and international economic and political events, none of which can be predicted with certainty. The Company operates in the exploration, development and production phase of the oil and gas industry. Its receivables include amounts due from purchasers of oil and gas production and amounts due from joint venture partners for their respective portions of operating expenses and exploration and development costs. The Company believes that no single customer or joint venture partner exposes the Company to significant credit risk. While certain of these customers and joint venture partners are affected by periodic downturns in the economy in general or in their specific segment of the natural gas or oil industry, the Company believes that its level of credit-related losses due to such economic fluctuations has been and will continue to be immaterial to the Company's results of operations in the long-term. Trade receivables are generally not collateralized. The Company analyzes customers' and joint venture partners' historical credit positions and payment histories prior to extending credit and continuously monitors all credit activities. Concentrations of Credit Risk. Derivative financial instruments that hedge the price of oil, natural gas and NGLs are generally executed with major financial or commodities trading institutions which expose the Company to market and credit risks and may, at times, be concentrated with certain counterparties or groups of counterparties. The Company's policy is to execute financial derivatives only with major, creditworthy financial institutions. The Company has derivative instruments with eight different counterparties, of which all are lenders or affiliates of lenders in the Amended Credit Facility. The creditworthiness of counterparties is subject to continuing review, and the Company believes all of these institutions currently are acceptable credit risks. Full performance is anticipated, and the Company has no past due receivables from any of its counterparties. Where the counterparty is a lender under the Amended Credit Facility, the counterparty risk is mitigated to the extent that the Company is indebted to such lender under the Amended Credit Facility.

Significant Customers and Other Concentrations

Significant Customers. During 2018, four customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. During 2017, three customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. During 2016, three customers individually accounted for over 10% of the Company's oil, gas and NGL production revenues. Collectability is dependent upon the financial stability of each individual company and is influenced by the general economic conditions of the industry. The Company normally sells production to a relatively small number of customers, as is customary in the development and production business. The Company sells natural gas and related NGLs to two primary gas gathering and processing companies. Based on where the Company operates and the availability of other purchasers and markets, the Company believes that its production could be sold in the market in the event that it is not sold to its existing customers. However, in some circumstances, a change in customers may entail significant costs during the transition to a new customer.

Concentrations of Market Risk. The future results of the Company's oil and gas operations will be affected by the market prices of oil, natural gas and NGLs. A readily available market for oil, natural gas and NGLs in the future will depend on numerous factors beyond the control of the Company, including weather, imports, marketing of competitive fuels, proximity and capacity of oil and gas pipelines and other transportation facilities, any oversupply or undersupply of oil, gas and NGLs, the regulatory environment, the economic environment and other regional, national and international economic and political events, none of which can be predicted with certainty.

The Company operates in the exploration, development and production phase of the oil and gas industry. Its receivables include amounts due from purchasers of oil and gas production and amounts due from joint venture partners for their respective portions of operating expenses and exploration and development costs. The Company believes that no single customer or joint venture partner exposes the Company to significant credit risk. While certain of these customers and joint venture partners are affected by periodic downturns in the economy in general or in their specific segment of the natural gas or oil industry, the Company believes that its level of credit-related losses due to such economic fluctuations has been and will continue to be immaterial to the Company's results of operations in the long-term. Trade receivables are generally not collateralized. The Company analyzes customers' and joint venture partners' historical credit positions and payment histories prior to extending credit and continuously monitors all credit activities.

Concentrations of Credit Risk. Derivative financial instruments that hedge the price of oil, natural gas and NGLs are generally executed with major financial or commodities trading institutions which expose the Company to market and credit risks and may, at times, be concentrated with certain counterparties or groups of counterparties. The Company's policy is to execute financial derivatives only with major, creditworthy financial institutions. The Company has derivative instruments with eight different counterparties, of which all are lenders or affiliates of lenders in the Amended Credit Facility.

The creditworthiness of counterparties is subject to continuing review, and the Company believes all of these institutions currently are acceptable credit risks. Full performance is anticipated, and the Company has no past due receivables from any of its counterparties. Where the counterparty is a lender under the Amended Credit Facility, the counterparty risk is mitigated to the extent that the Company is indebted to such lender under the Amended Credit Facility.