Goodwill and Other Intangible Assets, Net (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Components other intangible assets
Total gross definite life intangible assets	$ 64,249	$ 64,142
Less: accumulated amortization	55,309	52,996
Net definite life intangible assets	8,940	11,146
Total net intangible assets	21,125	16,994
Patents [Member]
Components other intangible assets
Total gross definite life intangible assets	36,257	35,944
Customer base/relationships [Member]
Components other intangible assets
Total gross definite life intangible assets	15,066	15,280
Internally developed software [Member]
Components other intangible assets
Total gross definite life intangible assets	5,722	5,722
Noncompete agreements [Member]
Components other intangible assets
Total gross definite life intangible assets	3,418	3,418
All other [Member]
Components other intangible assets
Total gross definite life intangible assets	3,786	3,778
Trade name [Member]
Components other intangible assets
Total net intangible assets	10,685	4,348
Horizon license [Member]
Components other intangible assets
Total net intangible assets	$ 1,500	$ 1,500