CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32,774	$ 314,466
Accounts receivable, net of allowance for doubtful accounts	72,943	51,415
Derivative assets	81,166	0
Prepayments and other current assets	2,898	1,782
Total current assets	189,781	367,663
Property and equipment - at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	2,195,310	1,361,168
Unproved oil and gas properties, excluded from amortization	468,208	84,676
Furniture, equipment and other	20,662	17,899
Property, plant and equipment, gross	2,684,180	1,463,743
Accumulated depreciation, depletion, amortization and impairment	(654,657)	(444,863)
Total property and equipment, net	2,029,523	1,018,880
Derivative assets	27,289	0
Deferred financing costs and other noncurrent assets	5,867	4,163
Total	2,252,460	1,390,706
Current liabilities:
Accounts payable and accrued liabilities	131,379	84,055
Amounts payable to oil and gas property owners	55,792	16,594
Production taxes payable	59,155	26,876
Derivative liabilities	0	20,940
Current portion of long-term debt	1,859	469
Total current liabilities	248,185	148,934
Long-term debt, net of debt issuance costs	617,387	617,744
Asset retirement obligations	27,330	16,097
Deferred income taxes	139,534	0
Derivatives and other noncurrent liabilities	7,926	9,377
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.001 par value; authorized 400,000,000 and 300,000,000 shares at December 31, 2018 and 2017 respectively; 212,477,101 and 110,363,539 shares issued and outstanding at December 31, 2018 and 2017, respectively, with 2,912,166 and 1,394,868 shares subject to restrictions, respectively	210	109
Additional paid-in capital	1,771,730	1,279,507
Retained earnings (accumulated deficit)	(559,842)	(681,062)
Treasury stock, at cost: zero shares at December 31, 2018 and 2017	0	0
Total stockholders' equity	1,212,098	598,554
Total	$ 2,252,460	$ 1,390,706