Acquisitions Consideration Paid (Details) - Jan. 20, 2015 - CoSine Communications, Inc. (CoSine) - USD ($) $ / shares in Units, $ in Thousands	Total
Business Acquisition [Line Items]
Fair Value of Consideration Paid	$ 66,239
API Technologies Corp. (API Tech)
Business Acquisition [Line Items]
Fair Value of Consideration Paid	$ 22,823
Payment to acquire business, shares	24,807,203
Price per share (in dollars per share)	$ 0.92
CoSine Communications, Inc. (CoSine)
Business Acquisition [Line Items]
Fair Value of Consideration Paid	$ 12,011
Payment to acquire business, shares	4,779,721
Price per share (in dollars per share)	$ 2.51
Nathan's Famous, Inc.
Business Acquisition [Line Items]
Fair Value of Consideration Paid	$ 31,405
Payment to acquire business, shares	445,456
Price per share (in dollars per share)	$ 70.50