Segment Reporting and Geographic Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Number of business segments	2
Network Integration segment [Member] | Major Customer, One [Member]
Segment Reporting Information [Line Items]
Amount of Revenue from One Customer	$ 41.0	$ 46.6	$ 43.4
Network Integration segment [Member] | Major Customer, One [Member] | Sales Revenue, Segment [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of Revenue from One Customer	24.00%	28.00%
Network Integration segment [Member] | Major Customer, One [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of Revenue from One Customer	5.00%	22.00%	20.00%
Network Integration segment [Member] | Major Customer, Two [Member]
Segment Reporting Information [Line Items]
Amount of Revenue from One Customer	$ 27.6	$ 22.7	$ 19.1
Network Integration segment [Member] | Major Customer, Two [Member] | Sales Revenue, Segment [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of Revenue from One Customer	16.00%	14.00%	13.00%
Network Integration segment [Member] | Major Customer, Two [Member] | Accounts Receivable [Member] | Credit Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of Revenue from One Customer	29.00%	27.00%	9.00%