Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents (Note 13)	$ 16,600	$ 14,114
Accounts receivable	26,431	8,044
Investment (Note 12)	44,116	48,323
Taxes receivable (Note 3)	47,772	49,925
Other current assets	17,141	13,459
Total Current Assets	152,060	133,865
Oil and Gas Properties
Proved	833,069	797,355
Unproved	158,483	161,763
Total Oil and Gas Properties	991,552	959,118
Other capital assets	3,085	5,364
Total Property, Plant and Equipment (Note 4)	994,637	964,482
Other Long-Term Assets
Deferred tax assets	13,349	57,318
Taxes receivable (Note 3)	14,447	42,635
Restricted cash and cash equivalents (Note 13)	3,532	3,409
Other	3,233	16
Total Other Long-Term Assets	34,561	103,378
Total Assets	1,181,258	1,201,725
Current Liabilities
Accounts payable and accrued liabilities	114,785	100,784
Derivatives (Note 12)	14,737	12,050
Taxes payable (Note 3)	5,938	0
Equity compensation award liability (Note 7 and 12)	2,132	805
Total Current Liabilities	137,592	113,639
Long-Term Liabilities
Long-term debt (Notes 6 and 12)	735,411	774,770
Asset retirement obligation	54,356	48,214
Equity compensation award liability (Note 7 and 12)	11,469	3,955
Other long-term liabilities	3,563	4,113
Total Long-Term Liabilities	804,799	831,052
Contingencies (Note 11)
Shareholders' Equity
Common Stock (Note 7) (367,038,454 and 366,981,556 shares issued and outstanding of Common Stock, par value $0.001 per share, as at September 30, 2021, and December 31, 2020, respectively)	10,270	10,270
Additional paid-in capital	1,286,893	1,285,018
Deficit	(1,058,296)	(1,038,254)
Total Shareholders' Equity	238,867	257,034
Total Liabilities and Shareholders’ Equity	$ 1,181,258	$ 1,201,725