Goodwill and Other Intangible Assets (Acquired Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 4,773,000	$ 4,773,000
Accumulated amortization	(4,753,000)	(4,662,000)
Intangible assets, net	20,000	111,000
Amortization of Intangible Assets	100,000	200,000	300,000
Estimated amortization expense for 2013	20,000
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	5 years
Gross carrying amount	4,273,000	4,273,000
Accumulated amortization	(4,253,000)	(4,162,000)
Intangible assets, net	20,000	111,000
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	3 years
Gross carrying amount	500,000	500,000
Accumulated amortization	(500,000)	(500,000)
Intangible assets, net	$ 0	$ 0