Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts receivable, net
Trade accounts	$ 161,085	$ 215,511
Joint interest accounts	673	467
Other accounts	9,528	1,312
Accounts receivable, net	171,286	217,290
Allowance for doubtful accounts	(1,286)	(1,286)
Accounts receivable, net	170,000	216,004
Other assets
Deferred compensation plan	15,717	14,966
Debt issuance costs	7,136	7,990
Other accounts	108	56
Other assets	22,961	23,012
Accounts payable
Trade accounts	19,858	7,815
Natural gas purchases	3,468	4,299
Royalty and other owners	27,614	39,207
Accrued transportation	46,704	51,433
Accrued capital costs	42,162	31,130
Taxes other than income	20,087	16,801
Deposits received for asset sales	5,000	81,500
Other accounts	9,769	5,860
Accounts payable	174,662	238,045
Accrued liabilities
Employee benefits	8,431	20,645
Taxes other than income	1,525	550
Income taxes payable	109	0
Asset retirement obligations	1,000	4,952
Other accounts	505	1,294
Accrued liabilities	11,570	27,441
Other liabilities
Deferred compensation plan	27,605	29,145
Other accounts	7,182	10,578
Other liabilities	$ 34,787	$ 39,723