CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Sales and other operating revenues	$ 498,202	$ 486,276	$ 1,552,473	$ 1,326,587
Gain (loss) on sale of assets	117	(730)	130,765	3,101
Total revenues	498,319	485,546	1,683,238	1,329,688
Costs and expenses
Lease operating expenses	112,751	119,663	346,072	435,296
Severance and ad valorem taxes	10,816	9,592	32,771	35,668
Exploration expenses	28,492	19,866	77,356	83,910
Selling and general expenses	56,672	55,523	168,259	196,143
Depreciation, depletion and amortization	243,636	255,900	714,782	797,288
Accretion of asset retirement obligations	10,654	11,043	31,638	35,514
Impairment of assets				95,088
Other expense (benefit)	2,454	6,486	10,988	(1,446)
Total costs and expenses	465,475	478,073	1,381,866	1,677,461
Operating income (loss) from continuing operations	32,844	7,473	301,372	(347,773)
Other income (loss)
Interest and other income (loss)	(47,721)	14,987	(93,524)	38,602
Interest expense, net	(48,681)	(39,219)	(138,423)	(103,889)
Total other loss	(96,402)	(24,232)	(231,947)	(65,287)
Income (loss) from continuing operations before income taxes	(63,558)	(16,759)	69,425	(413,060)
Income tax expense (benefit)	2,760	(2,176)	95,602	(201,897)
Loss from continuing operations	(66,318)	(14,583)	(26,177)	(211,163)
Income (loss) from discontinued operations, net of income taxes	425	(1,593)	1,177	(885)
NET LOSS	$ (65,893)	$ (16,176)	$ (25,000)	$ (212,048)
INCOME (LOSS) PER COMMON SHARE - BASIC
Continuing operations	$ (0.38)	$ (0.08)	$ (0.15)	$ (1.23)
Discontinued operations		(0.01)	0.01	(0.01)
Net loss	(0.38)	(0.09)	(0.14)	(1.24)
INCOME (LOSS) PER COMMON SHARE - DILUTED
Continuing operations	(0.38)	(0.08)	(0.15)	(1.23)
Discontinued operations		(0.01)	0.01	(0.01)
Net loss	(0.38)	(0.09)	(0.14)	(1.24)
Cash dividends per Common share	$ 0.25	$ 0.25	$ 0.75	$ 0.95
Average Common shares outstanding
Basic	172,572,873	172,199,350	172,509,418	172,164,683
Diluted	172,572,873	172,199,350	172,509,418	172,164,683