Transactions With Related Parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Partnerships	Dec. 31, 2018 USD ($) Partnerships	Dec. 31, 2017 USD ($)	Dec. 31, 2016 Partnerships
Related Party Transaction [Line Items]
Number of oil and gas limited partnerships for employee investment | Partnerships	13
Partnerships dissolved | Partnerships	0	0		2
Repurchase of limited units outstanding amount | $	$ 600,000
G. Bailey Peyton IV
Related Party Transaction [Line Items]
Payments for royalties | $	$ 400,000	$ 900,000	$ 700,000
Peyton Royalties, LP | G. Bailey Peyton IV
Related Party Transaction [Line Items]
Related party ownership percentage	99.50%