EARNINGS PER SHARE AND COMPREHENSIVE EARNINGS (LOSS) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net earnings	$ 87,718	$ 68,911	$ 123,362	$ 211,327
Net earnings attributable to noncontrolling interest	(4,923)	0	(4,987)	0
Net earnings attributable to participating securities	(1,863)	(1,427)	(2,413)	(4,116)
Net earnings attributable to common stock for basic earnings per share	80,932	67,484	115,962	207,211
Adjustment for liability classified stock-based compensation awards	(603)	74	(707)	250
Net earnings for diluted earnings per share	80,329	67,558	115,255	207,461
Earnings per Share
Weighted average common shares outstanding during the period for basic earnings per share (in shares)	111,810	110,992	111,598	110,691
Dilutive effects of potential common shares (in shares)	352	786	521	699
Weighted average common shares outstanding during the period, including the effects of dilutive potential common shares, for diluted earnings per share (in shares)	112,162	111,778	112,119	111,390
Comprehensive Earnings
Consolidated net earnings	87,718	68,911	123,362	211,327
Other comprehensive income:
Foreign currency translation (losses) gains	(38,234)	8,978	(27,763)	5,132
Unfunded postretirement benefits, net of tax	93	290	311	975
Total comprehensive earnings	49,577	78,179	95,910	217,434
Less: total comprehensive earnings attributable to noncontrolling interest	(1,824)	0	(1,330)	0
Total comprehensive earnings attributable to Forest Oil Corporation	51,401	78,179	97,240	217,434
Continuing Operations [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net earnings	59,610	55,571	78,793	183,766
Net earnings attributable to noncontrolling interest	0		0
Net earnings attributable to participating securities	(1,341)	(1,151)	(1,606)	(3,579)
Net earnings attributable to common stock for basic earnings per share	58,269	54,420	77,187	180,187
Adjustment for liability classified stock-based compensation awards	0	0	0	0
Net earnings for diluted earnings per share	58,269	54,420	77,187	180,187
Comprehensive Earnings
Consolidated net earnings	59,610	55,571	78,793	183,766
Discontinued Operations [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net earnings	28,108	13,340	44,569	27,561
Net earnings attributable to noncontrolling interest	(4,923)		(4,987)
Net earnings attributable to participating securities	(522)	(276)	(807)	(537)
Net earnings attributable to common stock for basic earnings per share	22,663	13,064	38,775	27,024
Adjustment for liability classified stock-based compensation awards	(603)	74	(707)	250
Net earnings for diluted earnings per share	22,060	13,138	38,068	27,274
Comprehensive Earnings
Consolidated net earnings	$ 28,108	$ 13,340	$ 44,569	$ 27,561

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