CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
OPERATING ACTIVITIES:
Net income	$ 10,501	$ 6,468
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	3,301	2,943
Facility-related liabilities	17	35
Right-of-use asset amortization	3,199	2,994
Deferred income taxes	(896)	23
Share-based compensation expense	842	655
Accounts receivable allowances	182	62
Unrealized foreign currency remeasurement gains, net	(284)	(398)
Changes in operating assets and liabilities:
Accounts receivable	19,838	1,388
Unbilled services, net	(23,063)	(8,217)
Prepaid expenses and other current assets, and other assets	(2,733)	(5,327)
Forgivable loans	4,140	(27,139)
Incentive cash awards	1,729	1,423
Accounts payable, accrued expenses, and other liabilities	(52,856)	(39,121)
Lease liabilities	(3,765)	(1,164)
Net cash used in operating activities	(39,848)	(65,375)
INVESTING ACTIVITIES:
Purchases of property and equipment	(692)	(7,949)
Net cash used in investing activities	(692)	(7,949)
FINANCING ACTIVITIES:
Issuance of common stock, principally stock option exercises	1,113	151
Borrowings under revolving line of credit	42,000	70,000
Repayments under revolving line of credit	(2,000)	0
Tax withholding payments reimbursed by shares	(588)	(390)
Cash paid for contingent consideration	(2,357)	0
Cash paid on dividend equivalents	(79)	(40)
Cash dividends paid to shareholders	(1,982)	(1,796)
Repurchase of common stock	(9,642)	(3,810)
Net cash provided by financing activities	26,465	64,115
Effect of foreign exchange rates on cash and cash equivalents	27	(612)
Net decrease in cash and cash equivalents	(14,048)	(9,821)
Cash and cash equivalents at beginning of period	45,677	25,639
Cash and cash equivalents at end of period	31,629	15,818
Noncash investing and financing activities:
Purchases of property and equipment not yet paid for	294	370
Asset retirement obligations	0	155
Right-of-use assets obtained in exchange for lease obligations	1,070	0
Restricted common stock issued for contingent consideration	2,250	0
Supplemental cash flow information:
Cash paid for taxes	844	695
Cash paid for interest	24	245
Cash paid for amounts included in operating lease liabilities	$ 5,157	$ 5,039