Shareholders' Equity (Options, Stock Option Activity) (Details) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019	Dec. 31, 2019 USD ($)
Number of options (000's)
Beginning balance (in shares) | shares	2,683
Issued (in shares) | shares	964
Exercised (in shares) | shares	(601)
Expired / Forfeited (in shares) | shares	(6)
Ending balance (in shares) | shares	3,040
Weighted average exercise price (CAD$)
Beginning balance (CAD per share) | $ / shares	$ 4.36
Issued (CAD per share) | $ / shares	7.44
Exercised (CAD per share) | $ / shares	4.07
Expired / Forfeited (CAD per share) | $ / shares	6.63
Ending balance (CAD per share) | $ / shares	$ 5.39
Weighted average remaining contractual life
Weighted average remaining contractual life	8 years 2 months 12 days	6 years 8 months 12 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value | $	$ 16,999		$ 7,790