Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2017	Sep. 28, 2016
Supplemental Cash Flow Information [Abstract]
Income taxes paid, net	$ 5,039	$ 1,140
Interest paid	10,547	8,197
Noncash investing and financing activities:
Property acquisition payable	500	0
Issuance of common stock, pursuant to share-based compensation plans	4,961	3,597
Execution of capital leases	4,959	7,180
Treasury stock payable	741	695
Notes received in connection with disposition of property	$ 1,750	$ 0