CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share data) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 14	$ 77,965
Accounts receivable	145,299	167,536
Derivative assets	67,567	175,130
Prepaid expenses and other	8,454	8,632
Total current assets	221,334	429,263
Property and equipment (successful efforts method):
Proved oil and gas properties	7,578,976	7,278,362
Accumulated depletion, depreciation, and amortization	(3,586,650)	(3,417,953)
Unproved oil and gas properties	1,529,825	1,581,401
Wells in progress	345,507	295,529
Properties held for sale, net	0	5,280
Other property and equipment, net of accumulated depreciation of $59,720 and $57,102, respectively	86,732	88,546
Total property and equipment, net	5,954,390	5,831,165
Noncurrent assets:
Derivative assets	27,202	58,499
Other noncurrent assets	83,692	33,935
Total noncurrent assets	110,894	92,434
Total assets	6,286,618	6,352,862
Current liabilities:
Accounts payable and accrued expenses	426,550	403,199
Derivative liabilities	95,269	62,853
Other current liabilities	23,523	0
Total current liabilities	545,342	466,052
Noncurrent liabilities:
Revolving credit facility	46,500	0
Senior Notes, net of unamortized deferred financing costs	2,449,588	2,448,439
Senior Convertible Notes, net of unamortized discount and deferred financing costs	150,199	147,894
Asset retirement obligations	94,026	91,859
Deferred income taxes	176,348	223,278
Derivative liabilities	13,332	12,496
Other noncurrent liabilities	68,058	42,522
Total noncurrent liabilities	2,998,051	2,966,488
Commitments and contingencies (note 6)
Stockholders’ equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding: 112,244,545 and 112,241,966 shares, respectively	1,122	1,122
Additional paid-in capital	1,771,558	1,765,738
Retained earnings	982,662	1,165,842
Accumulated other comprehensive loss	(12,117)	(12,380)
Total stockholders' equity	2,743,225	2,920,322
Total liabilities and stockholders’ equity	$ 6,286,618	$ 6,352,862