Summary of Significant Accounting Policies Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) months revenue_sources	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Product Liability Contingency [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 40	$ 64
Amortization of intangible assets	1,707	1,740	$ 1,547
Provision for inventory reserves and purchase order commitments	$ 0	306	5,606
New Product Warranty Period	12 months
Refurbished Product Warranty Period	3 months
Cash and Cash Equivalents [Abstract]
Cash Equivalents, Original Maturity Date of Acquisition, Maximum (in months) | months	3
Property, Plant and Equipment [Abstract]
Depreciation, Depletion and Amortization	$ 6,500	6,400	$ 5,600
Revenue Recognition [Abstract]
Number of Revenue Sources from Products and Services | revenue_sources	4
Deferred Revenue [Abstract]
Deferred Revenue, Current	$ 5,300	9,800
Deferred Costs, Current	$ 800	$ 1,200
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)	3 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Useful Life, Minimum (in years)	9 years