Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of Finite-lived intangible assets
Adjusted cost	$ 32,031	$ 32,031
Accumulated amortization	(19,802)	(17,637)
Net carrying amount	12,229	14,394
Developed technology [Member]
Summary of Finite-lived intangible assets
Adjusted cost	17,881	17,881
Accumulated amortization	(7,875)	(6,254)
Net carrying amount	10,006	11,627
Customer relationships [Member]
Summary of Finite-lived intangible assets
Adjusted cost	9,561	9,561
Accumulated amortization	(8,365)	(7,961)
Net carrying amount	1,196	1,600
Brand names [Member]
Summary of Finite-lived intangible assets
Adjusted cost	1,927	1,927
Accumulated amortization	(1,549)	(1,498)
Net carrying amount	378	429
Patented technology [Member]
Summary of Finite-lived intangible assets
Adjusted cost	2,252	2,252
Accumulated amortization	(1,889)	(1,856)
Net carrying amount	363	396
In-process research and development [Member]
Summary of Finite-lived intangible assets
Adjusted cost	330	330
Accumulated amortization	(52)
Net carrying amount	278	330
Trademark [Member]
Summary of Finite-lived intangible assets
Adjusted cost	80	80
Accumulated amortization	(72)	(68)
Net carrying amount	$ 8	$ 12