Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	$ 70,351	$ 72,514
Accumulated Amortization	(33,741)	(29,924)
Net Carrying Value	36,610	42,590
Trademarks [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	1,623	1,690
Accumulated Amortization	(1,533)	(1,283)
Net Carrying Value	90	407
Patents [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	6,890	6,824
Accumulated Amortization	(6,807)	(6,701)
Net Carrying Value	83	123
Customer related assets [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	47,069	48,460
Accumulated Amortization	(19,678)	(16,710)
Net Carrying Value	27,391	31,750
Non-compete agreements [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	2,153	2,195
Accumulated Amortization	(2,053)	(2,051)
Net Carrying Value	100	144
Developed technology [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	4,040	4,040
Accumulated Amortization	(1,998)	(1,592)
Net Carrying Value	2,042	2,448
Other [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	2,492	3,221
Accumulated Amortization	(1,672)	(1,587)
Net Carrying Value	820	1,634
Subtotal [Member]
Schedule of the balance of intangible assets by segment and the activity occurring in the past two fiscal years
Gross Carrying Value	64,267	66,430
Accumulated Amortization	(33,741)	(29,924)
Net Carrying Value	30,526	36,506
Trademarks and tradenames [Member]
Intangibles not subject to amortization:
Gross Carrying Value	6,084	6,084
Accumulated Amortization	0	0
Net Carrying Value	$ 6,084	$ 6,084