Consolidated balance sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 30,352	$ 32,672
Accounts receivable, net	78,871	86,867
Derivatives	27,575	20,947
Other current assets	15,831	14,291
Total current assets	152,629	154,777
Oil and natural gas properties, full cost method:
Evaluated properties	5,560,767	5,488,756
Unevaluated properties not being depleted	215,598	221,281
Less accumulated depletion and impairment	(4,544,547)	(4,514,183)
Oil and natural gas properties, net	1,231,818	1,195,854
Midstream service assets, net	125,287	126,240
Other fixed assets, net	44,379	44,773
Property and equipment, net	1,401,484	1,366,867
Derivatives	9,847	8,718
Investment in equity method investee	247,021	243,953
Other assets, net	7,615	8,031
Total assets	1,818,596	1,782,346
Current liabilities:
Accounts payable	24,738	15,054
Undistributed revenue and royalties	27,009	26,838
Accrued capital expenditures	44,519	30,845
Derivatives	3,132	20,993
Other current liabilities	62,937	94,215
Total current liabilities	162,335	187,945
Long-term debt, net	1,349,591	1,353,909
Derivatives	25	5,694
Asset retirement obligations	50,158	50,604
Other noncurrent liabilities	3,577	3,621
Total liabilities	1,565,686	1,601,773
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized and zero issued as of March 31, 2017 and December 31, 2016	0	0
Common stock, $0.01 par value, 450,000,000 shares authorized and 242,573,453 and 241,929,070 issued and outstanding as of March 31, 2017 and December 31, 2016, respectively	2,426	2,419
Additional paid-in capital	2,400,290	2,396,236
Accumulated deficit	(2,149,806)	(2,218,082)
Total stockholders' equity	252,910	180,573
Total liabilities and stockholders' equity	$ 1,818,596	$ 1,782,346