CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 19,568	$ 32,774
Accounts receivable, net of allowance for doubtful accounts	59,427	72,943
Derivative assets	36,114	81,166
Prepayments and other current assets	4,688	2,898
Total current assets	119,797	189,781
Property and equipment - at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	2,581,796	2,195,310
Unproved oil and gas properties, excluded from amortization	393,910	468,208
Furniture, equipment and other	29,152	20,662
Property, plant and equipment, gross	3,004,858	2,684,180
Accumulated depreciation, depletion, amortization and impairment	(876,869)	(654,657)
Total property and equipment, net	2,127,989	2,029,523
Derivative assets	10,010	27,289
Other noncurrent assets	5,831	5,867
Total	2,263,627	2,252,460
Current Liabilities:
Accounts payable and accrued liabilities	88,524	131,379
Amounts payable to oil and gas property owners	39,008	55,792
Production taxes payable	58,076	59,155
Current portion of long-term debt	0	1,859
Total current liabilities	185,608	248,185
Long-term debt, net of debt issuance costs	793,530	617,387
Asset retirement obligations	23,347	27,330
Deferred income taxes	114,263	139,534
Other noncurrent liabilities	17,316	7,926
Commitments and contingencies (Note 12)
Stockholders' Equity:
Common stock, $0.001 par value; authorized 400,000,000 shares; 213,676,102 and 212,477,101 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively, with 2,983,031 and 2,912,166 shares subject to restrictions, respectively	211	210
Additional paid-in capital	1,776,219	1,771,730
Retained earnings (accumulated deficit)	(646,867)	(559,842)
Treasury stock, at cost: zero shares at September 30, 2019 and December 31, 2018	0	0
Total stockholders' equity	1,129,563	1,212,098
Total liabilities and stockholders' equity	$ 2,263,627	$ 2,252,460