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Commitments And Contingencies (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2015
USD ($)
contract
Aug. 23, 2013
lawsuit
item
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
lawsuit
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Commitments And Contingencies [Abstract]              
Rent expense under operating leases     $ 3,542 $ 3,362 $ 9,717 $ 9,974  
Supply commitments for printer assemblies     38,307   38,307   $ 50,663
Total liabilities recorded for earnouts     9,563   $ 9,563   9,832
Number of lawsuits filed | lawsuit   2     9    
Number of alleged causes of action | item   7          
Number of alleged breaches of contract | contract 2            
Provision for litigation award $ 11,282         $ 11,282  
Redeemable noncontrolling interests     $ 8,872   $ 8,872   $ 8,872
Alleged actual damages 7,254            
Fees and expenses 2,318            
Prejudgment interest $ 1,710