Condensed Consolidated Income Statements (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Oil and natural gas	$ 103,099	$ 87,598
Contract drilling	45,989	37,185
Gas gathering and processing	56,044	50,941
Total revenues	205,132	175,724
Operating costs:
Oil and natural gas	35,962	29,204
Contract drilling	31,667	29,227
Gas gathering and processing	41,604	37,704
Total operating costs	109,233	96,135
Depreciation, depletion, and amortization	57,066	46,932
General and administrative	10,762	8,954
Gain on disposition of assets	(161)	(824)
Total operating expenses	176,900	151,197
Income from operations	28,232	24,527
Other income (expense):
Interest, net	(10,004)	(9,396)
Gain (loss) on derivatives	(6,762)	14,731
Other, net	6	3
Total other income (expense)	(16,760)	5,338
Income before income taxes	11,472	29,865
Income tax expense:
Deferred	3,607	13,936
Total income taxes	3,607	13,936
Net income	$ 7,865	$ 15,929
Net income per common share:
Basic	$ 0.15	$ 0.32
Diluted	$ 0.15	$ 0.31