Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortizable intangible assets:
Gross Carrying amount	$ 43,185	$ 43,019
Accumulated Amortization	35,265	32,702
Total	7,920	10,317
Customer relationships [Member]
Amortizable intangible assets:
Gross Carrying amount	33,759	33,379
Accumulated Amortization	26,644	24,925
Total	7,115	8,454
Research content [Member]
Amortizable intangible assets:
Gross Carrying amount	7,043	6,929
Accumulated Amortization	7,043	6,209
Total		720
Technology [Member]
Amortizable intangible assets:
Gross Carrying amount	1,507	1,507
Accumulated Amortization	702	442
Total	805	1,065
Trademarks [Member]
Amortizable intangible assets:
Gross Carrying amount	876	876
Accumulated Amortization	876	876
Other [Member]
Amortizable intangible assets:
Gross Carrying amount		328
Accumulated Amortization		250
Total		$ 78