Business Segment, Geographic and Major Customer Information - Major Customers (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Customer A [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers	15.50%		16.60%		16.60%		15.20%
Customer B [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers		[1]		[1]		[1]	10.40%
Customer C [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers		[1]	12.10%			[1]		[1]

[1] This customer did not account for more than 10% of revenue.