Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents		$ 209,276	$ 516
Accrued production receivable		77,344	139,407
Trade and other receivables, net		34,449	18,318
Derivative assets		47,655	11,936
Other current assets		20,724	10,434
Total current assets		389,448	180,611
Oil and natural gas properties (using full cost accounting)
Proved properties		11,702,063	11,447,680
Unevaluated properties		645,847	872,910
CO2 properties		1,198,981	1,198,846
Pipelines and plants		2,339,761	2,329,078
Other property and equipment		216,294	212,334
Less accumulated depletion, depreciation, amortization and impairment		(12,570,062)	(11,688,020)
Net property and equipment		3,532,884	4,372,828
Operating lease right-of-use assets		32,587	34,099
Other assets		103,116	104,329
Total assets		4,058,035	4,691,867
Current liabilities
Accounts payable and accrued liabilities		160,694	183,832
Oil and gas production payable		40,652	62,869
Derivative liabilities		7,691	8,346
Current maturities of long-term debt (including future interest payable of $119,454 and $86,054, respectively - see Note 4)	[1]	2,366,330	102,294
Operating lease liabilities		7,807	6,901
Total current liabilities		2,583,174	364,242
Long-term liabilities
Long-term debt, net of current portion (including future interest payable of $0 and $78,860, respectively - see Note 4)		145,922	2,232,570
Asset retirement obligations		177,030	177,108
Deferred tax liabilities, net		306,186	410,230
Operating lease liabilities		38,584	41,932
Other liabilities		2,720	53,526
Total long-term liabilities		670,442	2,915,366
Commitments and contingencies (Note 9)
Stockholders' equity
Preferred stock, $.001 par value, 25,000,000 shares authorized, none issued and outstanding		0	0
Common stock, $.001 par value, 750,000,000 shares authorized; 509,553,960 and 508,065,495 shares issued, respectively		510	508
Paid-in capital in excess of par		2,754,749	2,739,099
Accumulated deficit		(1,944,772)	(1,321,314)
Treasury stock, at cost, 1,828,444 and 1,652,771 shares, respectively		(6,068)	(6,034)
Total stockholders' equity		804,419	1,412,259
Total liabilities and stockholders' equity		$ 4,058,035	$ 4,691,867

[1] Our current maturities of long-term debt as of June 30, 2020 include $119.5 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months.