CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 264,544	$ 211,208
Restricted cash	47,149	44,737
Marketable securities	16,904	56,987
Accounts receivable, net:
Trade	6,931	7,893
Unbilled	181,040	158,508
Other	2,415	4,532
Prepaid insurance	15,620	21,300
Other current assets	9,651	11,488
Income taxes receivable	0	2,902
Deferred income taxes	7,211	3,233
Total current assets	551,465	522,788
Property and equipment:
Land	4,115	3,653
Buildings and improvements	68,583	67,496
Computer hardware and software	81,140	76,105
Software development costs	35,866	32,699
Furniture and fixtures	36,717	36,133
Aircraft	35,879	35,866
Total property and equipment, gross	262,300	251,952
Accumulated depreciation and amortization	(168,358)	(159,008)
Total property and equipment, net	93,942	92,944
Other assets:
Prepaid health insurance	9,000	9,000
Deposits - health insurance	3,000	2,640
Deposits - workers' compensation	64,201	52,320
Goodwill and other intangible assets, net	23,775	28,433
Other assets	4,817	4,134
Total other assets	104,793	96,527
Total assets	750,200	712,259
Current liabilities:
Accounts payable	3,660	5,085
Payroll taxes and other payroll deductions payable	178,534	168,652
Accrued worksite employee payroll cost	150,070	130,317
Accrued health insurance costs	13,942	9,427
Accrued workers' compensation costs	49,484	46,548
Accrued corporate payroll and commissions	23,537	22,383
Other accrued liabilities	12,478	13,814
Income tax payable	4,054	0
Total current liabilities	435,759	396,226
Noncurrent liabilities:
Accrued workers' compensation costs	64,536	60,054
Deferred income taxes	9,000	10,772
Total noncurrent liabilities	73,536	70,826
Commitments and contingencies
Stockholders' equity:
Preferred stock, par value $0.01 per share: Shares authorized - 20,000 Shares issued and outstanding - none	0	0
Common stock, par value $0.01 per share: Shares authorized - 60,000 Shares issued - 30,758 and 30,839 at December 31, 2012 and 2011, respectively	308	309
Additional paid-in capital	133,207	135,871
Treasury stock, at cost - 5,096 and 5,141 shares at December 31, 2012 and 2011, respectively	(133,950)	(134,647)
Accumulated other comprehensive income, net of tax	16	24
Retained earnings	241,324	243,650
Total stockholders' equity	240,905	245,207
Total liabilities and stockholders' equity	$ 750,200	$ 712,259