Reconciliation of Statutory Canadian Tax rate to Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Effective Tax Rate Reconciliation [Line Items]
Income Tax Provision (benefit)	$ 10,519	$ 10,394	$ (1,006)
Canada Revenue Agency
Schedule Of Effective Tax Rate Reconciliation [Line Items]
Statutory Canadian tax rate	28.50%	27.00%	27.00%
Expected income tax provision at Canadian statutory tax rate	$ 9,269	$ 12,426	$ (4,837)
International tax rate differences	891	304	(1,132)
State income taxes, net	503	453	(271)
Withholding and other taxes	441	731	421
Permanent differences	179	1,000	486
Acquisition contingent consideration adjustments	762
Transaction costs	649	270	8
Section 199 deduction	(1,063)	(1,188)	(574)
Change in valuation allowance	1,202	(612)	4,809
Provision to return differences	(93)	(617)	962
Tax credits	(1,095)	(990)	(1,678)
Statutory tax rate change	(856)	95	(13)
Uncertain tax positions	(103)	121	134
IRS audit		(748)	241
JK Lasers divestiture		(1,432)
Goodwill impairment			330
Other	(167)	581	108
Income Tax Provision (benefit)	$ 10,519	$ 10,394	$ (1,006)
Effective tax rate	32.30%	22.60%	5.60%