CAPITAL STOCK, Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Y		Dec. 31, 2010	Dec. 31, 2009
Market-Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield (in hundredths)	0.00%		0.00%
Stock Option Activity [Roll Forward]
Granted (in shares)	191,000
Options outstanding at end of period (in shares)	1,668,655
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.90%		4.09%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	41.50%		46.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	3.04		4.49
Stock Options [Member]
Stock Option Activity [Roll Forward]
Options outstanding at beginning of period (in shares)	5,241,898
Granted (in shares)	1,156,200	[1]
Exercised (in shares)	(165,992)
Forfeited or canceled (in shares)	(864,961)
Options outstanding at end of period (in shares)	5,367,145	[2]	5,241,898
Options vested at end of period or expected to vest (in shares)	4,640,363
Options exercisable at end of period (in shares)	1,992,345
Weighted-average exercise price, options outstanding at beginning of period (in dollars per share)	$ 19.76
Weighted-average exercise price, options granted (in dollars per share)	$ 20.04
Weighted-average exercise price, options exercised (in dollars per share)	$ 13.05
Weighted-average exercise price, options forfeited or canceled (in dollars per share)	$ 19.88
Weighted-average exercise price, options outstanding at end of period (in dollars per share)	$ 20.01		$ 19.76
Weighted-average exercise price, options vested at December 31, 2010 or expected to vest (in dollars per share)	$ 19.98
Weighted-average exercise price, options exercisable at December 31, 2010 (in dollars per share)	$ 21.42
Weighted-average remaining contractual term of options outstanding (in years)	4.47
Weighted-average remaining contractual term of options vested or expected to vest (in years)	4.43
Weighted-average remaining contractual term of options exercisable (in years)	3.65
Aggregate intrinsic value options outstanding	$ 26,000
Aggregate intrinsic value options vested or expected to vest	21,000
Aggregate intrinsic value options exercisable	1,000
Aggregate intrinsic value of stock options exercised	1,100,000		200,000	200,000
Cash received from the exercise of stock options	$ 2,200,000		$ 900,000	$ 500,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield (in hundredths)	0.00%		0.00%	0.00%
Stock Option Activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.03%		1.89%	2.21%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	41.40%		45.90%	55.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	4.48		4.42	4.38
Share-based Compensation Arrangements, Weighted-average fair value of shares issued, per share	$ 7.54		$ 5.55	$ 5.92

[1] Options granted during the year ended December 31, 2011 included 191,000 options that had vesting based on either market conditions or a combination of performance or market conditions.

[2] Options outstanding at December 31, 2011 included 1,668,655 options that had vesting based on either market conditions or a combination of performance or market conditions.