Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 35,329	$ 31,469
Finite-Lived Intangible Assets, Accumulated Amortization	(11,107)	(10,215)
Finite-Lived Intangible Assets, Net	24,222	21,254
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,857	6,455
Finite-Lived Intangible Assets, Accumulated Amortization	(1,774)	(1,704)
Finite-Lived Intangible Assets, Net	5,083	4,751
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,926	2,426
Finite-Lived Intangible Assets, Accumulated Amortization	(1,056)	(900)
Finite-Lived Intangible Assets, Net	3,870	1,526
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,983	1,983
Finite-Lived Intangible Assets, Accumulated Amortization	(474)	(436)
Finite-Lived Intangible Assets, Net	1,509	1,547
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,874	5,746
Finite-Lived Intangible Assets, Accumulated Amortization	(1,078)	(1,014)
Finite-Lived Intangible Assets, Net	4,796	4,732
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	335	315
Finite-Lived Intangible Assets, Accumulated Amortization	(119)	(108)
Finite-Lived Intangible Assets, Net	216	207
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	15,087	14,277
Finite-Lived Intangible Assets, Accumulated Amortization	(6,339)	(5,786)
Finite-Lived Intangible Assets, Net	8,748	8,491
Royalty Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	267	267
Finite-Lived Intangible Assets, Accumulated Amortization	(267)	(267)
Finite-Lived Intangible Assets, Net	$ 0	$ 0