Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2018	Jun. 28, 2017
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 1,495	$ 2,668
Interest paid	9,224	6,718
Noncash investing and financing activities:
Insurance proceeds receivable	282	0
Issuance of common stock, pursuant to share-based compensation plans	4,619	4,961
Execution of capital leases	2,484	4,225
Treasury stock payable	0	1,394
Notes received in connection with disposition of property	$ 0	$ 1,750