Additional Balance Sheet Information - Schedule of Additional Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts receivable, net
Trade accounts	$ 176,840	$ 185,594
Joint interest accounts	1,192	1,359
Other accounts	1,322	5,335
Accounts receivable, net	179,354	192,288
Allowance for doubtful accounts	(2,012)	(1,243)
Accounts receivable, net	177,342	191,045
Inventories
Tubular goods and well equipment	10,761	11,005
Natural gas in storage	319	2,299
Inventories	11,080	13,304
Other current assets
Prepaid balances and other	4,468	2,692
Derivative instruments	7,708	0
Other current assets	12,176	2,692
Other assets
Deferred compensation plan	13,765	12,587
Debt issuance costs	9,699	11,403
Derivative instruments	5,222	2,991
Other accounts	62	58
Other assets	28,748	27,039
Accounts payable
Trade accounts	32,574	27,355
Natural gas purchases	3,629	2,231
Royalty and other owners	83,750	85,449
Accrued capital costs	51,445	34,647
Taxes other than income	8,686	13,827
Other accounts	3,470	4,902
Accounts payable current	183,554	168,411
Accrued liabilities
Employee benefits	12,164	14,153
Taxes other than income	5,858	3,829
Asset retirement obligations	2,000	2,000
Other accounts	819	1,510
Accrued liabilities	20,841	21,492
Other liabilities
Deferred compensation plan	26,199	24,169
Other accounts	7,861	4,952
Other liabilities	$ 34,060	$ 29,121