CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share data) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 12	$ 77,965
Accounts receivable	165,757	167,536
Derivative assets	114,242	175,130
Prepaid expenses and other	8,723	8,632
Total current assets	288,734	429,263
Property and equipment (successful efforts method):
Proved oil and gas properties	7,974,754	7,278,362
Accumulated depletion, depreciation, and amortization	(3,774,548)	(3,417,953)
Unproved oil and gas properties	1,445,985	1,581,401
Wells in progress	257,945	295,529
Properties held for sale, net	0	5,280
Other property and equipment, net of accumulated depreciation of $62,372 and $57,102, respectively	81,193	88,546
Total property and equipment, net	5,985,329	5,831,165
Noncurrent assets:
Derivative assets	30,180	58,499
Other noncurrent assets	87,696	33,935
Total noncurrent assets	117,876	92,434
Total assets	6,391,939	6,352,862
Other property and equipment, accumulated depreciation	62,372	57,102
Current liabilities:
Accounts payable and accrued expenses	407,883	403,199
Derivative liabilities	70,259	62,853
Other current liabilities	25,803	0
Total current liabilities	503,945	466,052
Noncurrent liabilities:
Revolving credit facility	118,000	0
Senior Notes, net of unamortized deferred financing costs	2,450,737	2,448,439
Senior Convertible Notes, net of unamortized discount and deferred financing costs	152,503	147,894
Asset retirement obligations	95,194	91,859
Deferred income taxes	190,146	223,278
Derivative liabilities	12,431	12,496
Other noncurrent liabilities	67,140	42,522
Total noncurrent liabilities	3,086,151	2,966,488
Commitments and contingencies (note 6)
Stockholders’ equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding: 112,525,633 and 112,241,966 shares, respectively	1,125	1,122
Additional paid-in capital	1,779,665	1,765,738
Retained earnings	1,033,051	1,165,842
Accumulated other comprehensive loss	(11,998)	(12,380)
Total stockholders' equity	2,801,843	2,920,322
Total liabilities and stockholders’ equity	$ 6,391,939	$ 6,352,862
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	112,525,633	112,241,966
Common Stock, Shares, Outstanding	112,525,633	112,241,966