CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
OPERATING ACTIVITIES:
Net income	$ 17,802	$ 15,984
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	9,293	7,701
Facility-related liabilities	104	83
Right-of-use asset amortization	8,900	7,832
Deferred income taxes	496	117
Share-based compensation expense	2,357	2,641
Accounts receivable allowances	(894)	(160)
Unrealized foreign currency remeasurement losses, net	129	0
Changes in operating assets and liabilities:
Accounts receivable	1,952	3,626
Unbilled services, net	(14,994)	(14,582)
Prepaid expenses and other current assets, and other assets	(979)	(5,735)
Forgivable loans	(18,963)	(18,942)
Incentive cash awards	4,862	3,628
Accounts payable, accrued expenses, and other liabilities	(15,191)	(16,274)
Lease liabilities	(5,526)	(5,826)
Net cash used in operating activities	(10,652)	(19,907)
INVESTING ACTIVITIES:
Purchases of property and equipment	(15,742)	(12,548)
Net cash used in investing activities	(15,742)	(12,548)
FINANCING ACTIVITIES:
Issuance of common stock, principally stock option exercises	1,667	2,006
Borrowings under revolving line of credit	77,000	54,000
Repayments under revolving line of credit	(39,000)	(18,000)
Tax withholding payments reimbursed by shares	(390)	(388)
Cash paid on dividend equivalents	(40)	(35)
Cash dividends paid to shareholders	(5,372)	(4,742)
Repurchase of common stock	(8,807)	(18,068)
Net cash provided by financing activities	25,058	14,773
Effect of foreign exchange rates on cash and cash equivalents	(195)	(513)
Net decrease in cash and cash equivalents	(1,531)	(18,195)
Cash and cash equivalents at beginning of period	25,639	38,028
Cash and cash equivalents at end of period	24,108	19,833
Noncash investing and financing activities:
Purchases of property and equipment not yet paid for	3,923	3,461
Purchases of property and equipment paid by a third party	0	126
Asset retirement obligations	155	427
Right-of-use assets obtained in exchange for lease obligations	2,601	37,298
Right-of-use assets related to the adoption of ASC 842	0	82,329
Lease liabilities related to the adoption of ASC 842	0	106,765
Supplemental cash flow information:
Cash paid for taxes	5,933	6,078
Cash paid for interest	932	848
Cash paid for amounts included in operating lease liabilities	$ 13,736	$ 12,053