Contingencies And Commitments (Narrative) (Details) $ in Thousands	3 Months Ended
	Apr. 02, 2017 USD ($)
Contingencies, Commitments And Guarantees [Line Items]
Aggregate notional value standby letters of credit	$ 39,089
Minimum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Expiration period, minimum in months and maximum in years	1 month
Maximum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Expiration period, minimum in months and maximum in years	5 years