Intangible Assets and Goodwill (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	$ 57,235	$ 58,737
Accumulated amortization	(52,040)	(51,116)
Customer relationships
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	39,601	40,751
Accumulated amortization	(37,077)	(36,949)
Technology
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	13,377	13,467
Accumulated amortization	(12,238)	(11,495)
Licenses and other
Summary of cost, accumulated amortization and net book value of intangible assets
Cost	4,257	4,519
Accumulated amortization	$ (2,725)	$ (2,672)