Segment Customer and Geographic Information (Details 2)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues to customers outside
Total sales	10.00%	10.00%
Europe, Middle East, & Africa [Member]
Revenues to customers outside
Total sales	10.00%	15.00%
Asia Pacific [Member]
Revenues to customers outside
Total sales	7.00%	10.00%
Other Americas [Member]
Revenues to customers outside
Total sales	5.00%	6.00%
Foreign [Member]
Revenues to customers outside
Total sales	22.00%	31.00%