Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts receivable, net
Trade accounts	$ 220,612	$ 362,973
Joint interest accounts	198	101
Other accounts	996	567
Accounts receivable, gross	221,806	363,641
Allowance for doubtful accounts	(1,074)	(1,238)
Accounts receivable, net	220,732	362,403
Other assets
Deferred compensation plan	16,818	14,699
Debt issuance costs	3,718	4,572
Income taxes receivable	0	8,165
Operating lease right-of-use assets	42,174	0
Other accounts	60	61
Other assets	62,770	27,497
Accounts payable
Trade accounts	25,700	30,033
Natural gas purchases	8,661	0
Royalty and other owners	37,833	61,507
Accrued transportation	49,496	50,540
Accrued capital costs	51,842	43,207
Taxes other than income	25,455	19,824
Income taxes payable	1,807	1,134
Other accounts	3,750	35,694
Accounts payable	204,544	241,939
Accrued liabilities
Employee benefits	14,173	21,761
Taxes other than income	3,858	1,472
Operating lease liabilities	7,517	0
Asset retirement obligations	1,000	1,000
Other accounts	707	994
Accrued liabilities	27,255	25,227
Other liabilities
Deferred compensation plan	29,758	25,780
Operating lease liabilities	34,502	0
Other accounts	8,014	34,391
Other liabilities	$ 72,274	$ 60,171