CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share data) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 643,337		$ 313,943
Accounts receivable	192,562		160,154
Derivative assets	77,296		64,266
Prepaid expenses and other	9,997		10,752
Total current assets	923,192		549,115
Property and equipment (successful efforts method):
Proved oil and gas properties	5,824,014		6,139,379
Accumulated depletion, depreciation, and amortization	(2,893,674)		(3,171,575)
Unproved oil and gas properties	1,986,070		2,047,203
Wells in progress	405,549		321,347
Oil and gas properties held for sale, net	234,618		111,700
Other property and equipment, net of accumulated depreciation of $52,483 and $49,985, respectively	112,972		106,738
Total property and equipment, net	5,669,549		5,554,792
Noncurrent assets:
Derivative assets	35,128		40,362
Other noncurrent assets	32,119		32,507
Total noncurrent assets	67,247		72,869
Total assets	6,659,988		6,176,776
Current liabilities:
Accounts payable and accrued expenses	468,108		386,630
Derivative liabilities	181,068		172,582
Total current liabilities	649,176		559,212
Noncurrent liabilities:
Revolving credit facility	0		0
Senior Notes, net of unamortized deferred financing costs	2,770,979		2,769,663
Senior Convertible Notes, net of unamortized discount and deferred financing costs	141,269		139,107
Asset retirement obligations	85,407		103,026
Asset retirement obligations associated with oil and gas properties held for sale	23,139		11,369
Deferred income taxes	178,423		79,989
Derivative liabilities	53,712		71,402
Other noncurrent liabilities	45,786		48,400
Total noncurrent liabilities	3,298,715		3,222,956
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding: 111,687,016 and 111,687,016 shares, respectively	1,117		1,117
Additional paid-in capital	1,747,035		1,741,623
Retained earnings	980,444	[1]	665,657
Accumulated other comprehensive loss	(16,499)	[1]	(13,789)
Total stockholders' equity	2,712,097		2,394,608
Total liabilities and stockholders' equity	$ 6,659,988		$ 6,176,776

[1] The Company reclassified $3.0 million of tax effects stranded in accumulated other comprehensive loss to retained earnings as of January 1, 2018. Please refer to Note 1 - Summary of Significant Accounting Policies for further detail.