Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Line Items]
Deferred Federal and State Income Tax Expense (Benefit)	$ 300,000
Goodwill Amortization Period, Tax Purposes	15 years
U.S. Federal Income Tax Rate	34.00%
Tax Benefit from Stock Options Exercised	700,000	500,000	800,000
Operating Loss Carryforwards	25,800,000
Unrecognized Tax Benefits	290,000	465,000
Unrecognized Tax Benefits Adjusted Due to Expiring Credits	100,000
Capital Loss Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	1,100,000
Alternative minimum tax carryforward [Member]
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	300,000
Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax Credit Carryforward, Amount	$ 2,100,000