Business Segment, Geographic and Major Customer Information - Major Customers (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Customer A [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers	16.90%		13.10%	17.20%		14.50%
Customer B [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers		[1]	10.60%		[1]	10.80%
Customer C [Member]
Summary of revenue from major costumers
Percentage of revenue by major customers		[1]	10.60%		[1]		[1]

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