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Completed wells

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Interest rate of employee partnerships in oil and gas properties

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Number of oil and gas limited partnerships

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Number of oil and gas limited partnerships for employee investment

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Number of oil and gas limited partnerships for third party investment

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Number of wells drilled

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Related party ownership percentage

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Unit wells	Dec. 31, 2014 USD ($) wells	Dec. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships \| Unit	15
Number of oil and gas limited partnerships for third party investment \| Unit	2
Number of oil and gas limited partnerships for employee investment \| Unit	13
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%
G. Bailey Peyton IV
Related Party Transaction [Line Items]
Payments for royalties	$ 800	$ 1,300	$ 1,400
Toklan Oil and Gas Company \| John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage	25.80%
Number of wells drilled	0	2	0
Completed wells \| wells	1	1
Revenue from related parties	$ 500	$ 1,500
Cash received from related parties	900	1,100
Related party accounts receivable balance	0	400
Payments for royalties	$ 0	$ 200	$ 0
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	$ 100
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