Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 45,151	$ 112,159
Accounts receivable, net	94,321	100,645
Derivatives	39,835	6,892
Other current assets	13,445	15,686
Total current assets	192,752	235,382
Oil and natural gas properties, full cost method:
Evaluated properties	6,752,631	6,070,940
Unevaluated properties not being depleted	130,957	175,865
Less accumulated depletion and impairment	(4,854,017)	(4,657,466)
Oil and natural gas properties, net	2,029,571	1,589,339
Other fixed assets, net	39,819	40,721
Property and equipment, net	2,199,635	1,768,385
Derivatives	11,030	3,413
Other noncurrent assets, net	16,888	16,109
Total assets	2,420,305	2,023,289
Current liabilities:
Accounts payable and accrued liabilities	69,504	58,341
Accrued capital expenditures	29,975	82,721
Undistributed revenue and royalties	48,841	37,852
Derivatives	7,359	22,950
Other current liabilities	44,786	75,555
Total current liabilities	200,465	277,419
Long-term debt, net	983,636	791,855
Derivatives	0	384
Asset retirement obligations	53,387	53,962
Other noncurrent liabilities	8,587	134,090
Total liabilities	1,246,075	1,257,710
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized and zero issued as of December 31, 2018 and 2017	0	0
Common stock, $0.01 par value, 450,000,000 shares authorized and 233,936,358 and 242,521,143 issued and outstanding as of December 31, 2018 and 2017, respectively	2,339	2,425
Additional paid-in capital	2,375,286	2,432,262
Accumulated deficit	(1,203,395)	(1,669,108)
Total stockholders' equity	1,174,230	765,579
Total liabilities and stockholders' equity	$ 2,420,305	$ 2,023,289