Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 29, 2018	Dec. 29, 2017
Current assets:
Cash and cash equivalents	$ 117,773	$ 124,794
Short-term investments	75,534	71,604
Accounts receivable, net of allowance for contract losses and doubtful accounts of $3,644 and $3,526 at June 29, 2018 and December 29, 2017, respectively	116,532	110,100
Prepaid expenses and other assets	9,184	9,011
Total current assets	319,023	315,509
Property, equipment and leasehold improvements, net	41,357	35,014
Goodwill	8,607	8,607
Deferred income taxes	31,824	30,437
Deferred compensation plan assets	53,801	48,676
Other assets	1,081	1,346
Total assets	455,693	439,589
Current liabilities:
Accounts payable and accrued liabilities	12,403	14,741
Accrued payroll and employee benefits	56,843	70,064
Deferred revenues	8,007	8,302
Total current liabilities	77,253	93,107
Other liabilities	3,225	3,326
Deferred compensation	55,310	52,776
Deferred rent	1,139	1,292
Total liabilities	136,927	150,501
Stockholders’ equity:
Common stock, $0.001 par value; 120,000 shares authorized; 65,707 shares issued at June 29, 2018 and December 29, 2017	66	66
Additional paid-in capital	223,696	210,230
Accumulated other comprehensive income (loss)
Investment securities, available-for-sale	(257)	(236)
Foreign currency translation adjustments	(2,422)	(1,793)
Accumulated other comprehensive income (loss)	(2,679)	(2,029)
Retained earnings	322,437	303,990
Treasury stock, at cost; 13,669 and 14,169 shares held at June 29, 2018 and December 29, 2017, respectively	(224,754)	(223,169)
Total stockholders’ equity	318,766	289,088
Total liabilities and stockholders’ equity	$ 455,693	$ 439,589