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Commitments And Contingencies (Details) $ in Thousands				3 Months Ended		9 Months Ended
Commitments And Contingencies (Details) $ in Thousands	Oct. 01, 2015 lawsuit	Sep. 28, 2015 USD ($)	Aug. 23, 2013 lawsuit	Sep. 30, 2015 USD ($) lawsuit	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies [Abstract]
Rent expense under operating leases				$ 3,362	$ 2,763	$ 9,974	$ 7,673
Supply commitments, printer assembly				59,636		59,636		$ 56,620
Accrued liability recorded for earnouts				$ 9,569		9,569		9,155
Shareholder class action lawsuits, number \| lawsuit	4		2	3
Redeemable noncontrolling interests				$ 8,872		8,872		$ 8,872
Provision for litigation award				$ 11,282		$ 11,282
Litigation Settlement, Amount		$ 7,254,000
Litigation Settlement, Expense		2,318,000
Litigation Settlement Interest		$ 1,710,000