Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts receivable, net
Trade accounts	$ 189,244	$ 185,594
Joint interest accounts	1,448	1,359
Other accounts	3,334	5,335
Accounts receivable, net	194,026	192,288
Allowance for doubtful accounts	(1,243)	(1,243)
Accounts receivable, net	192,783	191,045
Inventories
Tubular goods and well equipment	10,335	11,005
Natural gas in storage	1,760	2,299
Inventories	12,095	13,304
Other current assets
Prepaid balances and other	1,523	2,692
Derivative instruments	2,826	0
Other current assets	4,349	2,692
Other assets
Deferred compensation plan	13,566	12,587
Debt issuance costs	10,554	11,403
Derivative instruments	7,506	2,991
Other accounts	106	58
Other assets	31,732	27,039
Accounts payable
Trade accounts	27,881	27,355
Natural gas purchases	903	2,231
Royalty and other owners	92,562	85,449
Accrued capital costs	41,342	34,647
Taxes other than income	17,780	13,827
Other accounts	2,837	4,902
Accounts payable current	183,305	168,411
Accrued liabilities
Employee benefits	6,746	14,153
Taxes other than income	4,025	3,829
Asset retirement obligations	2,000	2,000
Other accounts	1,528	1,510
Accrued liabilities	14,299	21,492
Other liabilities
Deferred compensation plan	25,420	24,169
Other accounts	5,381	4,952
Other liabilities	$ 30,801	$ 29,121