Revenue Recognition (Tables)

9 Months Ended

Sep. 29, 2018

Revenue Recognition [Abstract]

Schedule Of Contract Liabilities From Contract With Customers

	Nine Months Ended
	September 29,
	2018
Contract liabilities at beginning of period	$                  14,417
Increase due to deferral of revenue	17,601
Decreases due to recognition of revenue	(14,141)
Contract liabilities at end of period	$                  17,877