Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Cash Flows From Operating Activities:
Net income	$ 8,691	$ 14,337
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,277	12,357
Non-cash lease expense	4,307	4,251
Provision for doubtful accounts	1,690	1,456
Stock-based compensation	6,880	4,167
Change in fair value of contingent consideration	0	49
Gain on disposals of property and equipment	(350)	(48)
Deferred income taxes	(869)	477
Amortization of debt issuance costs	442	0
Changes in operating assets and liabilities, net of impact of acquisitions:
Billed receivables	(1,134)	5,511
Unbilled receivables	(2,286)	(5,188)
Prepaid expenses and other assets	2,117	(9,413)
Accounts payable	138	(3,816)
Accrued liabilities	1,922	968
Income taxes payable	613	(2,338)
Billings in excess of costs and estimated earnings on uncompleted contracts	5,241	(5,383)
Deposits	66	47
Net cash provided by operating activities	50,745	17,434
Cash Flows From Investing Activities:
Cash paid for acquisitions (net of cash received from acquisitions)	0	(14,160)
Proceeds from sale of assets	437	0
Purchase of property and equipment	(6,145)	(1,626)
Net cash used in investing activities	(5,708)	(15,786)
Cash Flows From Financing Activities:
Borrowings from Senior Credit Facility	0	10,000
Payments on notes payable	(8,415)	(6,738)
Payments of contingent consideration	(913)	(1,213)
Payments of borrowings from Senior Credit Facility	(1,875)	0
Payments of debt issuance costs	(447)	0
Net cash (used in) provided by financing activities	(11,650)	2,049
Net increase in Cash and Cash Equivalents	33,387	3,697
Cash and cash equivalents – beginning of period	31,825	40,739
Cash and cash equivalents – end of period	65,212	44,436
Non-cash investing and financing activities:
Notes payable and other obligations issued for acquisitions	0	8,100
Stock issuance for acquisitions	558	2,230
Finance leases	409	690
Payment of contingent consideration with common stock	$ 278	$ 725