Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 29, 2019	Dec. 28, 2018
Current assets:
Cash and cash equivalents	$ 79,080	$ 127,059
Short-term investments	92,680	81,495
Accounts receivable, net of allowance for contract losses and doubtful accounts of $4,713 and $4,066 at March 29, 2019 and December 28, 2018, respectively	118,864	105,814
Prepaid expenses and other current assets	13,986	12,244
Total current assets	304,610	326,612
Property, equipment and leasehold improvements, net	50,854	46,103
Operating lease right-of-use assets	23,852	0
Goodwill	8,607	8,607
Deferred income taxes	33,878	34,090
Deferred compensation plan assets	66,395	52,286
Other assets	1,024	1,238
Total assets	489,220	468,936
Current liabilities:
Accounts payable and accrued liabilities	12,377	12,283
Accrued payroll and employee benefits	46,406	76,855
Deferred revenues	7,567	9,166
Operating lease liabilities	5,843	0
Total current liabilities	72,193	98,304
Other liabilities	2,702	2,548
Deferred compensation plan liabilities	66,670	52,708
Deferred rent	0	1,467
Operating lease liabilities	18,478	0
Total liabilities	160,043	155,027
Stockholders' equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at March 29, 2019 and December 28, 2018	66	66
Additional paid-in capital	238,916	227,283
Accumulated other comprehensive income (loss)
Investment securities, available-for-sale	109	(45)
Foreign currency translation adjustments	(2,691)	(2,808)
Accumulated other comprehensive income (loss)	(2,582)	(2,853)
Retained earnings	350,506	342,024
Treasury stock, at cost; 13,806 and 14,208 shares held at March 29, 2019 and December 28, 2018, respectively	(257,729)	(252,611)
Total stockholders' equity	329,177	313,909
Total liabilities and stockholders' equity	$ 489,220	$ 468,936