Description of Business and Summary of Significant Accounting Policies (Advertising and Sales Commission) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Advertising Expense	$ 1,400	$ 1,000	$ 973
Deferred Sales Commission	442	402
Amortization of Deferred Sales Commissions	$ 1,100	$ 465