Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable
Accounts receivable	$ 184,732	$ 167,536
Oil, gas, and NGL production revenue [Member]
Accounts Receivable
Accounts receivable	146,308	107,230
Amounts due from joint interest owners [Member]
Accounts Receivable
Accounts receivable	22,681	31,497
State severance tax refunds [Member]
Accounts Receivable
Accounts receivable	4,069	4,415
Derivative settlements [Member]
Accounts Receivable
Accounts receivable	6,868	9,475
Other [Member]
Accounts Receivable
Accounts receivable	$ 4,806	$ 14,919