Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 613,534	$ 80,171
Restricted cash	2,517	58,715
Joint interest and other receivables	167,573	211,308
Other current assets	23,149	134,434
Short-term investments	340,418	1,185,335
Total current assets	1,147,191	1,669,963
Oil and natural gas properties, net of accumulated depletion of $20,204 and $0 as of December 31, 2016 and 2015, respectively	1,078,885	2,359,033
Other property, net of accumulated depreciation and amortization of $8,426 and $12,859, as of December 31, 2016 and 2015, respectively	3,902	12,309
Other assets	500	19,914
Total assets	2,230,478	4,061,219
Current liabilities:
Trade and other accounts payable	36,954	6,945
Accrued liabilities	227,418	369,692
Accrued contract amendment costs	19,582
Angolan preliminary consideration	250,000	250,000
Total current liabilities	533,954	626,637
Long-term debt	2,479,349	1,981,895
Long-term derivative liabilities	50,123
Asset retirement obligations	6,523	3,167
Other long-term liabilities	1,863	3,383
Commitments and contingencies
Stockholders' Equity:
Common stock, $0.01 par value per share; 2,000,000,000 shares authorized, 441,210,817 and 408,740,182 issued and outstanding as of December 31, 2016 and 2015, respectively	4,412	4,088
Additional paid-in capital	4,219,611	4,164,097
Accumulated deficit	(5,065,357)	(2,722,048)
Total stockholders' equity	(841,334)	1,446,137
Total liabilities and stockholders' equity	$ 2,230,478	$ 4,061,219