CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Dec. 31, 2016	Dec. 26, 2015
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 22,044	$ 36,683	$ 34,091	$ 87,756
Restricted cash	905	909	398	586
Cash, cash equivalents, and restricted cash	22,949	37,592	$ 34,489	$ 88,342
SUPPLEMENTAL INFORMATION:
Interest paid	3,910	2,587
Income taxes paid	34,108	43,384
NON-CASH FINANCING ACTIVITIES:
Common stock issued under deferred compensation plans	$ 4,673	$ 3,657