Annual report pursuant to Section 13 and 15(d)

Discontinued Operations (Narrative) (Details)

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Discontinued Operations (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
GDS Business [Member]
Aug. 31, 2011
GDS Business [Member]
Dec. 31, 2013
GDS Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Initial cash payment for sale of operation     $ 30,000,000  
Aggregate maximum future royalty revenue from discontinued operation sold       20,000,000
Sale price of discontinued operation     30,300,000  
Additional cash payment received for sale of discontinued operation, attributable to a working capital adjustment     338,000  
Fees associated with the sale of the operation     2,800,000  
Balance sheet dispositions and write-offs at sale of operation     2,400,000  
Cash payment for transfer of extended warranty contracts   178,000    
Recognition of unamortized deferred revenue   1,200,000    
Gain on sale of discontinued operation 26,200,000      
Estimated tax liability from gain on sale of discontinued operation $ 6,700,000