Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 351,685	$ 355,428
Restricted cash	1,655	250
Accounts receivable (Note 5)	69,362	43,035
Inventory (Note 5)	7,116	5,669
Taxes receivable	21,485	6,974
Prepaids	3,597	1,940
Deferred tax assets (Note 9)	3,029	4,852
Total Current Assets	457,929	418,148
Oil and Gas Properties (using the full cost method of accounting)
Proved	618,982	442,404
Unproved	417,868	278,753
Total Oil and Gas Properties	1,036,850	721,157
Other capital assets	7,992	5,867
Total Property, Plant and Equipment (Note 6)	1,044,842	727,024
Other Long Term Assets
Restricted cash	13,227	1,190
Deferred tax assets (Note 9)	4,747	0
Other long term assets	3,454	311
Goodwill (Note 2)	102,581	102,581
Total Other Long Term Assets	124,009	104,082
Total Assets	1,626,780	1,249,254
Current Liabilities
Accounts payable (Note 10)	82,189	76,023
Accrued liabilities (Note 10)	66,832	32,120
Taxes payable	95,482	43,832
Asset retirement obligation (Note 8)	326	338
Total Current Liabilities	244,829	152,313
Long Term Liabilities
Deferred tax liability (Note 9)	186,799	204,570
Equity tax payable (Note 9)	6,484	0
Asset retirement obligation (Note 8)	12,343	4,469
Other long term liabilities	2,007	1,036
Total Long Term Liabilities	207,633	210,075
Commitments and Contingencies (Note 11)
Subsequent Events (Note 15)
Shareholders' Equity
Common shares (Note 7) (262,304,249 and 240,440,830 common shares and 16,323,819 and 17,681,123 exchangeable shares, par value $0.001 per share, issued and outstanding as at December 31, 2011 and 2010, respectively)	7,510	4,797
Additional paid in capital	980,014	821,781
Warrants (Note 7)	1,780	2,191
Retained earnings	185,014	58,097
Total Shareholders' Equity	1,174,318	886,866
Total Liabilities and Shareholders' Equity	$ 1,626,780	$ 1,249,254