Income Taxes (Narrative) (Details) $ in Thousands, CAD in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2016 CAD	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Income Taxes [Line Items]
Income tax	CAD 2.2		$ 5,700		$ 4,560	$ 1,787	$ 1,654
Pre-tax income					$ 12,451	$ 15,600	$ 14,645
Effective tax rate					36.60%	11.50%	11.30%
Percentage of income tax expense attributable to Canada					47.60%
State income tax (net of federal benefit)					2.40%	0.20%	0.00%
U.S. Federal income tax statutory rate					35.00%	34.00%	34.00%
Liability for uncertain tax positions taken on a foreign tax return		$ 800			$ 800
Penalties and interest related to unrecognized tax benefits					100	$ 100
Income tax net operating loss carryforwards		14,900			14,900
Total deferred tax assets		3,523			3,523
Unrecognized tax benefits that would impact effective tax rate		800			800
Tax Act [Member]
Income Taxes [Line Items]
Income tax		5,400			$ (300)
Effective tax rate					24.66%
State income tax (net of federal benefit)					3.66%
U.S. Federal income tax statutory rate				21.00%
Liability for uncertain tax positions taken on a foreign tax return		$ 5,100			$ 5,100