Basis of Presentation (Details) Other Balance Sheet and Income Statement Items (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Other Balance Sheet and Income Statement Items [Line Items]
Software subscription agreements, term			1 year
Inventory, Raw Materials:
Raw materials inventory	$ 10,400,000		$ 10,400,000		$ 8,100,000
Provision for Income Taxes:
Income tax provision (benefit)	(3,637,000)	403,000	(2,739,000)	1,477,000
Effective income tax rate	34.00%	5.00%	(17.00%)	6.00%
Statutory income tax rate			35.00%
Deferred income tax expense related to disposition	$ 3,800,000
Maximum
Provision for Income Taxes:
Likelihood uncertain tax percentage will be sustained			50.00%