Segment Reporting and Geographic Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2013 segments	Mar. 31, 2013 Major Customer, One [Member] Network Integration [Member]	Mar. 31, 2012 Major Customer, One [Member] Network Integration [Member]	Mar. 31, 2013 Major Customer, One [Member] Network Integration [Member] Customer Concentration Risk [Member] Accounts Receivable [Member]	Dec. 31, 2012 Major Customer, One [Member] Network Integration [Member] Customer Concentration Risk [Member] Accounts Receivable [Member]	Mar. 31, 2013 Major Customer, Two [Member] Network Integration [Member] Customer Concentration Risk [Member] Accounts Receivable [Member]	Dec. 31, 2012 Major Customer, Two [Member] Network Integration [Member] Customer Concentration Risk [Member] Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Number of Business Segments	2
Amount of Revenue from One Customer		$ 11.3	$ 10.8
Percentage of Revenue from One Customer		29.00%	32.00%
Percentage of Accounts Receivable				16.00%	21.00%	12.00%	9.00%