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Commitments And Contingencies (Narrative) (Details)
$ in Thousands
12 Months Ended
Sep. 28, 2015
USD ($)
Aug. 23, 2013
lawsuit
Dec. 31, 2017
USD ($)
lawsuit
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Other Commitments [Line Items]          
Supply commitments     $ 83,305   $ 62,935
Total liabilities recorded for earnouts     5,115   10,806
Redeemable noncontrolling interests     8,872   8,872
Accrued litigation settlement     50,000    
Insurance proceeds receivable     $ 50,000    
Number of stockholder class action lawsuits | lawsuit   2 9    
Percentage of ownership for officer     50.00%    
Provision for arbitration award       $ 11,282  
Alleged actual damages $ 7,254        
Fees and expenses 2,318        
Prejudgment interest $ 1,710        
Printer Assemblies And Inventory Items [Member]          
Other Commitments [Line Items]          
Supply commitments     $ 57,592   51,156
Capital Expenditures And Operating Costs [Member]          
Other Commitments [Line Items]          
Supply commitments     $ 25,713   $ 11,779