STOCK-BASED COMPENSATION PLANS (Details 3) (Stock options) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012 USD ($)	Dec. 31, 2012 CAD	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Range of exercise prices $3.98 - $7.93 U.S. USD ($)	Dec. 31, 2012 Range of exercise prices $3.95 - $7.86 Cdn CAD	Dec. 31, 2012 Range of exercise prices $7.94 - $9.16 U.S. USD ($)	Dec. 31, 2012 Range of exercise prices $7.87 - $9.09 Cdn CAD	Dec. 31, 2012 Range of exercise prices $9.17 - $11.10 U.S. USD ($)	Dec. 31, 2012 Range of exercise prices $9.10 - $11.02 Cdn CAD	Dec. 31, 2012 Range of exercise prices $11.11 - $19.40 U.S. USD ($)	Dec. 31, 2012 Range of exercise prices 11.03 - $19.25 Cdn CAD
Stock options outstanding and exercisable
Exercise price, low end of range (in dollars per share)					$ 3.98	3.95	$ 7.94	7.87	$ 9.17	9.10	$ 11.11	11.03
Exercise price, high end of range (in dollars per share)					$ 7.93	7.86	$ 9.16	9.09	$ 11.10	11.02	$ 19.40	19.25
Options Outstanding
Number Of Options (in shares)	2,355,877	2,355,877			601,145	601,145	568,076	568,076	486,416	486,416	700,240	700,240
Weighted Average Remaining Option Life	2 years 6 months	2 years 6 months			3 years 1 month 6 days	3 years 1 month 6 days	3 years	3 years	2 years 9 months 18 days	2 years 9 months 18 days	1 year 4 months 24 days	1 year 4 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 9.96	9.89			$ 6.73	6.68	$ 8.34	8.27	$ 10.27	10.20	$ 13.85	13.74
Options Exercisable
Number Of options Exercisable (in shares)	1,220,948	1,220,948			185,921	185,921	232,003	232,003	267,013	267,013	536,011	536,011
Weighted Average Exercise Price (in dollars per share)	$ 10.98	10.90			$ 4.61	4.57	$ 8.59	8.52	$ 10.10	10.02	$ 14.67	14.56
Other disclosures
Unrecognized stock-based compensation cost (in dollars)	$ 3,836		$ 3,969	$ 3,782
Weighted average period for recognition of unrecognized stock-based compensation cost	2 years 4 months 24 days	2 years 4 months 24 days	2 years 7 months 6 days	2 years 2 months 12 days

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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