Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable
Accounts receivable	$ 162,455	$ 184,732
Oil, gas, and NGL production revenue [Member]
Accounts Receivable
Accounts receivable	108,928	146,308
Amounts due from joint interest owners [Member]
Accounts Receivable
Accounts receivable	31,514	22,681
State severance tax refunds [Member]
Accounts Receivable
Accounts receivable	2,301	4,069
Derivative settlements [Member]
Accounts Receivable
Accounts receivable	16,348	6,868
Other [Member]
Accounts Receivable
Accounts receivable	$ 3,364	$ 4,806