Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents		$ 2,545	$ 2,812
Accrued production receivable		120,473	100,413
Trade and other receivables, net		70,700	87,093
Derivative assets		4,699	142,846
Other current assets		14,402	10,005
Total current assets		212,819	343,169
Oil and natural gas properties (using full cost accounting)
Proved properties		10,346,027	10,245,195
Unevaluated properties		909,310	894,948
CO2 properties		1,186,596	1,187,458
Pipelines and plants		2,294,295	2,293,219
Other property and equipment		399,880	408,194
Less accumulated depletion, depreciation, amortization and impairment		(10,521,061)	(9,653,205)
Net property and equipment		4,615,047	5,375,809
Derivative assets		31	0
Other assets		162,076	166,555
Total assets		4,989,973	5,885,533
Current liabilities
Accounts payable and accrued liabilities		162,334	253,197
Oil and gas production payable		83,713	87,337
Derivative liabilities		107,105	0
Current maturities of long-term debt	[1]	83,762	32,481
Total current liabilities		436,914	373,015
Long-term liabilities
Long-term debt, net of current portion		2,998,268	3,245,114
Asset retirement obligations		143,981	138,919
Derivative liabilities		67	0
Deferred tax liabilities, net		519,207	852,089
Other liabilities		26,232	27,484
Total long-term liabilities		3,687,755	4,263,606
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $.001 par value, 25,000,000 shares authorized, none issued and outstanding		0	0
Common stock, $.001 par value, 600,000,000 shares authorized; 395,347,234 and 354,541,626 shares issued, respectively		395	355
Paid-in capital in excess of par		2,520,760	2,353,549
Accumulated deficit		(1,608,701)	(1,058,954)
Treasury stock, at cost, 3,745,901 and 3,124,311 shares, respectively		(47,150)	(46,038)
Total stockholders' equity		865,304	1,248,912
Total liabilities and stockholders' equity		$ 4,989,973	$ 5,885,533

[1] Future interest payable on our 9% Senior Secured Second Lien Notes due 2021 represents most of the interest due over the term of this obligation, which has been accounted for as debt in accordance with Financial Accounting Standards Board Codification (“FASC”) 470-60, Troubled Debt Restructuring by Debtors. Our current maturities of long-term debt as of June 30, 2016 include $51.0 million of future interest payable related to this balance that is due within the next twelve months. See 2016 Senior Subordinated Notes Exchange below for further discussion.