CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 673,092	$ 100,415
Restricted cash	23,747	80,000
Receivables:
Joint interest billings	199,699	124,449
Oil sales	109,475
Notes		113,889
Other	981	615
Inventories	27,101	37,674
Prepaid expenses and other	13,913	13,278
Current deferred tax assets	64,473	89,600
Total current assets	1,112,481	559,920
Property and equipment:
Oil and gas properties, net of accumulated depletion of $135,622 and $6,430, respectively	1,367,265	989,869
Other property, net of accumulated depreciation of $8,068 and $5,343, respectively	9,776	8,131
Property and equipment - net	1,377,041	998,000
Other assets:
Restricted cash	3,800	32,000
Long-term receivables - joint interest billings, net of allowance of zero and $39.8 million, respectively		21,897
Deferred financing costs and other assets, net of accumulated amortization of $6,582 and $32,093, respectively	54,847	78,217
Long-term deferred tax assets - net	3,765
Derivatives		1,501
Total assets	2,551,934	1,691,535
Current liabilities:
Current maturities of long-term debt		245,000
Accounts payable	278,006	163,495
Accrued liabilities	37,194	53,208
Derivatives	24,407	20,354
Total current liabilities	339,607	482,057
Long-term liabilities:
Long-term debt	1,110,000	800,000
Derivatives	8,427	15,104
Asset retirement obligations	20,670	16,752
Deferred tax liability	47,608	12,513
Other long-term liabilities	4,896	1,014
Total long-term liabilities	1,191,601	845,383
Shareholders' equity/unit holdings equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at December 31, 2011 and 2010
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 390,530,946 and zero issued at December 31, 2011 and 2010, respectively	3,905
Common units, 100,000,000 units authorized; zero and 19,069,662 issued at December 31, 2011 and 2010, respectively		516
Additional paid-in capital	1,629,453
Accumulated deficit	(616,148)	(615,515)
Accumulated other comprehensive income	3,522	588
Treasury stock, at cost, 649,818 and zero shares at December 31, 2011 and 2010, respectively	(6)
Total shareholders' equity/unit holdings equity	1,020,726	(614,411)
Total liabilities, convertible preferred units and shareholders' equity/unit holdings equity	2,551,934	1,691,535
Series A Convertible preferred units
Convertible preferred units, 100,000,000 units authorized:
Convertible preferred units		383,246
Series B Convertible preferred units
Convertible preferred units, 100,000,000 units authorized:
Convertible preferred units		568,163
Series C Convertible preferred units
Convertible preferred units, 100,000,000 units authorized:
Convertible preferred units		$ 27,097