Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended									0 Months Ended
	Dec. 26, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2012 Potentially Dilutive Shares [Member]	Dec. 31, 2011 Potentially Dilutive Shares [Member]	Dec. 31, 2010 Potentially Dilutive Shares [Member]	Mar. 01, 2013 Subsequent Event [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stipulation of settlement, payment to plaintiff, warrants											$ 250,000
Expected volatility rate											55.00%
Risk free interest rate											0.80%
Stipulation of Settlement, payment to plaintiff, warrants, term											5 years
Warrants, fair value per share											4.30
Antidilutive securities excluded from computation of earnings per share (in shares)					416,300	404,800	400,100	4,400	37,800	42,700
Purchase of treasury shares, value		3,257,000	425,000	1,494,000
Prepaid expenses included in other assets		1,800,000	1,000,000
Cost of sales related to service revenue		33,600,000	29,100,000
Advertising Expense		$ 1,200,000	$ 1,300,000	$ 1,400,000
Stockholders' equity, reverse stock split, conversion ratio	5.00%