Commitments And Contingencies (Details) $ in Thousands			12 Months Ended
	Sep. 28, 2015 USD ($)	Aug. 23, 2013 lawsuit	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)
Other Commitments [Line Items]
Supply commitments for printer assemblies			$ 50,663
Total liabilities recorded for earnouts			9,832	$ 10,806
Number of stockholder class action lawsuits | lawsuit		2
Provision for arbitration 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
Put Option [Member]
Other Commitments [Line Items]
Aggregate amount to owner upon exercise				$ 8,872