Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Oil and natural gas	$ 83,173	$ 69,190	$ 170,771	$ 127,464
Contract drilling	39,255	24,257	76,440	62,967
Gas gathering and processing	48,153	44,858	99,094	84,058
Total revenues	170,581	138,305	346,305	274,489
Operating costs:
Oil and natural gas	32,758	33,331	61,962	66,677
Contract drilling	27,239	19,254	56,466	47,352
Gas gathering and processing	36,042	32,381	73,746	63,447
Total operating costs	96,039	84,966	192,174	177,476
Depreciation, depletion, and amortization	50,080	52,878	97,012	108,468
Impairments (Note 2)	0	74,291	0	112,120
General and administrative	8,713	8,348	17,667	16,959
Gain on disposition of assets	(248)	(477)	(1,072)	(669)
Total operating expenses	154,584	220,006	305,781	414,354
Income (loss) from operations	15,997	(81,701)	40,524	(139,865)
Other income (expense):
Interest, net	(9,467)	(10,606)	(18,863)	(20,223)
Gain (loss) on derivatives	8,902	(22,672)	23,633	(11,743)
Other	6	1	9	(14)
Total other income (expense)	(559)	(33,277)	4,779	(31,980)
Income (loss) before income taxes	15,438	(114,978)	45,303	(171,845)
Income tax expense (benefit):
Deferred	6,379	(42,842)	20,315	(58,560)
Total income taxes	6,379	(42,842)	20,315	(58,560)
Net income (loss)	$ 9,059	$ (72,136)	$ 24,988	$ (113,285)
Net income (loss) per common share:
Basic	$ 0.18	$ (1.44)	$ 0.49	$ (2.27)
Diluted	$ 0.17	$ (1.44)	$ 0.49	$ (2.27)