Segment Reporting and Geographic Information (Revenues by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 50,736	$ 38,385	$ 38,175	$ 38,905	$ 45,954	$ 34,666	$ 37,626	$ 33,415	$ 166,201	$ 151,661	$ 157,068
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									166,347	160,148	172,602
Network Equipment segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									90,711	87,727	96,166
Network Integration segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									75,636	72,421	76,436
Intersegment adjustments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									$ (146)	$ (8,487)	$ (15,534)