Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Operating activities
Net income	$ 15,087	$ 10,336
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,059	25,190
Other	(129)	(909)
Changes in operating assets and liabilities:
Accounts receivable	(9,598)	(9,662)
Operating liabilities	(8,907)	1,123
Other, net	(850)	1,589
Adjustments to reconcile net income to net cash provided by operating activities:	7,575	17,331
Net cash provided by operating activities	22,662	27,667
Capital expenditures:
Equipment	(40,228)	(37,858)
Land and building	(238)	(2,992)
Purchases of businesses, net of cash acquired	(2,544)	(7,452)
Other	4,396	2,667
Net cash used in investing activities	(38,614)	(45,635)
Financing activities
Revolving credit facility proceeds, net	39,000	35,500
Purchase of common shares for treasury	(26,356)	(17,002)
Sale of common shares from treasury	12,920	10,136
Dividends	(1,218)	(1,268)
Payments of notes payable	(9,032)	(8,721)
Net cash provided by financing activities	15,314	18,645
(Decrease)/increase in cash	(638)	677
Cash, beginning of period	13,121	9,006
Cash, end of period	12,483	9,683
Supplemental cash flow information follows:
Interest paid	3,118	2,480
Income taxes paid	$ 5,126	$ 3,179