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Stockholders' Equity (Summary of Option Activity) (Details) shares in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2017 $ / shares shares	Sep. 30, 2017 CAD / shares shares	Jun. 30, 2017 $ / shares shares	Jun. 30, 2017 CAD / shares shares	Mar. 31, 2017 $ / shares shares	Mar. 31, 2017 CAD / shares shares	Sep. 30, 2016 shares	Sep. 30, 2017 $ / shares shares	Sep. 30, 2017 CAD / shares shares	Sep. 30, 2016 shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Options Exercised							(324)			(324)
Weighted-average Exercise Price Exercised | CAD / shares									CAD 2.05
Weighted-average Exercise Price, Forfeited | CAD / shares									CAD 0
Stock Option In Canadian Dollars [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Options Outstanding at Beginning	963	963	999	999	999	999		999	999
Number of Options Exercised	(135)	(135)	(36)	(36)	0	0
Number of Options Forfeited	(91)	(91)	0	0	0	0
Number of Options Outstanding at Ending	737	737	963	963	999	999		737	737
Weighted-average Exercise Price outstanding at Beginning | CAD / shares		CAD 2.37		CAD 2.38		CAD 2.38			CAD 2.38
Weighted-average Exercise Price Exercised | CAD / shares		2.43		2.42		0
Weighted-average Exercise Price, Forfeited | CAD / shares		2.40		0		0
Weighted-average Exercise Price Outstanding at Ending | CAD / shares		CAD 2.36		CAD 2.37		CAD 2.38			CAD 2.36
Stock Option In Us Dollars [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Options Outstanding at Beginning	1,678	1,678	1,428	1,428	1,428	1,428		1,428	1,428
Number of Options Granted	21	21	300	300	0	0
Number of Options Exercised	(72)	(72)	(50)	(50)	0	0
Number of Options Forfeited	(3)	(3)	0	0	0	0
Number of Options Outstanding at Ending	1,624	1,624	1,678	1,678	1,428	1,428		1,624	1,624
Weighted-average Exercise Price outstanding at Beginning | $ / shares	$ 2.48		$ 1.93		$ 1.93			$ 1.93
Weighted-average Exercise Price Granted | $ / shares	6.72		4.84		0
Weighted-average Exercise Price Exercised | $ / shares	1.69		0.64		0
Weighted-average Exercise Price, Forfeited | $ / shares	2.79		0		0
Weighted-average Exercise Price Outstanding at Ending | $ / shares	$ 2.57		$ 2.48		$ 1.93			$ 2.57

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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