Intangible Assets (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Amortized intangible assets
Gross Carrying Value	$ 54,202,000	$ 58,097,000
Accumulated Amortization	35,292,000	34,967,000
Net Carrying Value	18,910,000	23,130,000
Distribution networks [Member]
Amortized intangible assets
Gross Carrying Value	38,060,000	38,060,000
Accumulated Amortization	21,908,000	18,621,000
Net Carrying Value	16,152,000	19,439,000
Customer contracts and relationships [Member]
Amortized intangible assets
Gross Carrying Value	14,722,000	14,937,000
Accumulated Amortization	12,648,000	12,087,000
Net Carrying Value	2,074,000	2,850,000
Completed technologies [Member]
Amortized intangible assets
Gross Carrying Value	670,000	4,350,000
Accumulated Amortization	215,000	3,800,000
Net Carrying Value	455,000	550,000
Other [Member]
Amortized intangible assets
Gross Carrying Value	750,000	750,000
Accumulated Amortization	521,000	459,000
Net Carrying Value	$ 229,000	$ 291,000