Business Description, Basis of Presentation and Significant Accounting Policies Summary of Significant Accounting Policies - Warranties (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Product Warranty Accrual	$ 365	$ 385	$ 467
Warranty accruals/additions	354	443
Warranty Usage	$ (374)	$ (525)