Stock Based Compensation - Schedule of Stock Option Outstanding by Exercise Price (Details) (Stock Options, Third Amended and Restated 1997 Stock Option Plan) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended				12 Months Ended						12 Months Ended						12 Months Ended
	Dec. 31, 2012 CAD	Dec. 31, 2011 CAD	Dec. 31, 2010 CAD	Dec. 31, 2009 CAD	Dec. 31, 2012 0 to 2.50 USD ($)	Dec. 31, 2011 0 to 2.50 USD ($)	Dec. 31, 2010 0 to 2.50 USD ($)	Dec. 31, 2012 0 to 2.50 CAD	Dec. 31, 2011 0 to 2.50 CAD	Dec. 31, 2010 0 to 2.50 CAD	Dec. 31, 2012 2.51 to 4.00 USD ($)	Dec. 31, 2011 2.51 to 4.00 USD ($)	Dec. 31, 2010 2.51 to 4.00 USD ($)	Dec. 31, 2012 2.51 to 4.00 CAD	Dec. 31, 2011 2.51 to 4.00 CAD	Dec. 31, 2010 2.51 to 4.00 CAD	Dec. 31, 2012 4.01 to 7.00 USD ($)	Dec. 31, 2011 4.01 to 7.00 USD ($)	Dec. 31, 2010 4.01 to 7.00 USD ($)	Dec. 31, 2012 4.01 to 7.00 CAD	Dec. 31, 2011 4.01 to 7.00 CAD	Dec. 31, 2010 4.01 to 7.00 CAD
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit of exercise prices (Cdn$)					$ 0	$ 0	$ 0				$ 2.51	$ 2.51	$ 2.51				$ 4.01	$ 4.01	$ 4.01
Upper range limit of exercise prices (Cdn$)					$ 2.50	$ 2.5	$ 2.5				$ 4.00	$ 4.00	$ 4.00				$ 7.00	$ 7.00	$ 7.00
Number of options outstanding at end of year	12,337	8,539	6,724					5,984	1,619	1,472				5,187	5,688	3,965				1,166	1,232	1,287
Weighted average remaining contractual life of options	6 years 2 months 12 days	6 years 10 months 24 days	7 years		6 years 7 months 6 days	7 years 2 months 12 days	7 years 6 months				6 years 2 months 12 days	7 years 3 months 18 days	7 years 2 months 12 days				3 years 8 months 12 days	4 years 9 months 18 days	6 years
Weighted average exercise price of options outstanding (Cdn$ per share)	2.74	3.18	3.35	3.19				1.88	1.66	1.61				3.23	3.22	3.43				4.99	5.00	4.98
Number of options exercisable at end of year	7,920	6,233	4,622					2,641	1,215	804				4,158	3,901	2,845				1,121	1,117	973
Weighted average exercise price of exercisable options (Cdn$ per share)	3.04	3.29	3.48					1.80	1.64	1.53				3.30	3.32	3.44				5.00	5.02	5.10