Goodwill: (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill:

Schedule of goodwill

	December 31, 2012		December 31, 2011
Balance, beginning of period	$	55,814	$	8,202
Acquisition of Emer (note 4(a))	—		50,774
Acquisition of AFV (note 4(b))	—		2,701
Impact of foreign exchange	1,065		(5,863		)
Balance, end of period	$	56,879	$	55,814