Business Segment, Geographic and Major Customer Information (Details 2)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Customer A [Member]
Summary of revenue from major costumers
Percentage of revenue by two major customers	16.60%	14.60%		15.20%		13.70%
Customer B [Member]
Summary of revenue from major costumers
Percentage of revenue by two major customers	9.50%	12.80%		10.40%		11.70%
Customer C [Member]
Summary of revenue from major costumers
Percentage of revenue by two major customers	12.10%	5.80%	[1]	9.80%	[1]	4.50%	[1]

[1] * Less than 10% of consolidated revenue