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Completed wells

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Interest rate of employee partnerships in oil and gas properties

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Interest received on senior notes

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Number of oil and gas limited partnerships for employee investment

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Number of wells drilled

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Partnerships dissolved

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Related party ownership percentage

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Senior subordinated note purchase

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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The amount of cash paid for royalties during the current period.

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Amount of transactions with related party during the financial reporting period.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Transactions With Related Parties (Narrative) (Details)	12 Months Ended
Transactions With Related Parties (Narrative) (Details)	Dec. 31, 2016 USD ($) Partnerships Unit	Dec. 31, 2015 USD ($) Partnerships wells	Dec. 31, 2014 USD ($) Partnerships wells	Nov. 30, 2016 USD ($)	May 31, 2016 USD ($)	Mar. 10, 2016 USD ($)
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships for employee investment \| Unit	13
Partnerships dissolved \| Partnerships	2	0	1
Minimum
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	1.00%
Maximum
Related Party Transaction [Line Items]
Interest rate of employee partnerships in oil and gas properties	15.00%
John Nikkel
Related Party Transaction [Line Items]
John Nikkel senior subordinated note purchase						$ 400,000
Interest John Nikkel received on senior notes				$ 13,250	$ 4,800
G. Bailey Peyton IV
Related Party Transaction [Line Items]
Payments for royalties	$ 500,000	$ 800,000	$ 1,300,000
Toklan Oil and Gas Company \| John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	25.80%
Number of wells drilled	0	0	2
Completed wells \| wells		1	1
Revenue from related parties		$ 500,000	$ 1,500,000
Cash received from related parties	$ 0	900,000	1,100,000
Related party accounts receivable balance		0	400,000
Payments for royalties	$ 0	0	$ 200,000
Toklan Oil and Gas Company \| Robert Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	20.00%
West Thomas Field Services, LLC \| John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	25.00%
Revenue from related parties	$ 400,000	100,000
West Thomas Field Services, LLC \| Robert Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	20.00%
Gas Gathering and Processing Equipment \| Toklan Oil and Gas Company \| John Nikkel
Related Party Transaction [Line Items]
Amount received from Toklan for gathering system		$ 500,000