Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Operating activities
Net earnings (loss)	$ 777	$ (8,912)	$ 4,124	$ 16,683
Items not affecting cash:
Depreciation and amortization	8,751	8,186	17,673	16,488
Amortization of debt issuance costs	1,065	684	2,004	1,339
Deferred income taxes	2,958	(2,356)	3,218	4,971
Stock-based compensation	1,932	2,998	4,379	2,835
Unrealized loss (gain) on derivative contracts	(406)	(400)	150	(288)
Gain on settlement of contingent consideration obligation (note 10)	0	0	(2,286)	0
Loss (gain) on sale of business	0	201	0	(45,378)
Other	(11)	(72)	(101)	(134)
Changes in non-cash working capital, net of businesses acquired or sold	(12,401)	(31,989)	8,253	(27,188)
Net cash flows from operating activities	2,665	(31,660)	37,414	(30,672)
Investing activities
Purchases of property, plant and equipment	(6,370)	(9,341)	(16,059)	(17,315)
Net proceeds from sale of business		(201)		64,675
Acquisition of business, net of cash acquired		(3,341)		(3,341)
Other	41		41
Net cash flows from investing activities	(6,329)	(12,883)	(16,018)	44,019
Financing activities
Increase (decrease) under line of credit facilities	(21,257)	43,367	(41,011)	(11,294)
Borrowings under long-term debt		24	155	1,876
Repayment of long-term debt	(744)	(634)	(1,341)	(1,357)
Proceeds on issuance of preferred stock, net of issuance costs	26,804		26,804
Payment of cash dividends on preferred stock		(1,700)	(1,700)	(3,400)
Proceeds from the exercise of stock options and employee purchases	349	336	571	647
Payment of withholding taxes on stock-based awards	(1,030)	(299)	(1,151)	(382)
Payment of debt issuance costs	(415)	(81)	(2,488)	(395)
Payment of contingent consideration	(1,100)		(1,100)
Other		(5)	(4)	216
Net cash flows from financing activities	2,607	41,008	(21,265)	(14,089)
Foreign exchange gain (loss) on cash held in a foreign currency	12	50	(4)	(8)
Increase (decrease) in cash and cash equivalents in the period	(1,045)	(3,485)	127	(750)
Cash and cash equivalents - beginning of the period	2,670	6,015	1,498	3,280
Cash and cash equivalents - end of the period	$ 1,625	$ 2,530	$ 1,625	$ 2,530