Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable, net
Trade accounts	$ 162,069	$ 185,594
Joint interest accounts	1,208	1,359
Other accounts	425	5,335
Accounts receivable, net	163,702	192,288
Allowance for doubtful accounts	(2,012)	(1,243)
Accounts receivable, net	161,690	191,045
Inventories
Tubular goods and well equipment	12,130	11,005
Natural gas in storage	867	2,299
Inventories	12,997	13,304
Other current assets
Prepaid balances and other	3,587	2,692
Derivative instruments	2,536	0
Other current assets	6,123	2,692
Other assets
Deferred compensation plan	14,336	12,587
Debt issuance costs	8,845	11,403
Derivative instruments	3,763	2,991
Other accounts	101	58
Other assets	27,045	27,039
Accounts payable
Trade accounts	25,851	27,355
Natural gas purchases	3,457	2,231
Royalty and other owners	33,135	36,472
Accrued transportation	48,104	48,977
Accrued capital costs	33,440	34,647
Taxes other than income	12,938	13,827
Other accounts	3,864	4,902
Accounts payable	160,789	168,411
Accrued liabilities
Employee benefits	17,065	14,153
Taxes other than income	4,018	3,829
Asset retirement obligations	6,073	2,000
Other accounts	158	1,510
Accrued liabilities	27,314	21,492
Other liabilities
Deferred compensation plan	27,598	24,169
Other accounts	8,810	4,952
Other liabilities	$ 36,408	$ 29,121