Transactions With Related Parties (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships	15
Number of oil and gas limited partnerships for third party investment	2
Number of oil and gas limited partnerships for employee investment	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%
John Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage in Toklan	0.065
Number of wells drilled	2	0	0
Revenue from related parties	$ 1,100,000	$ 0	$ 0
Related party accounts receivable balance	400,000	0	0
Payments for royalties	200,000	0	0
Robert Nikkel
Related Party Transaction [Line Items]
Related party ownership percentage in Toklan	0.353
G. Bailey Peyton IV
Related Party Transaction [Line Items]
Number of wells drilled	0	0	3.0
Revenue from related parties	0	0	1,600,000
Payments for royalties	$ 1,300,000	$ 1,400,000	$ 1,200,000

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Number of oil and gas limited partnerships

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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 in Toklan

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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 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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