CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 211,208	$ 234,829
Restricted cash	44,737	41,204
Marketable securities	56,987	43,367
Accounts receivable, net:
Trade	7,893	1,194
Unbilled	158,508	134,187
Other	4,532	6,726
Prepaid insurance	21,300	24,978
Other current assets	11,488	8,528
Income taxes receivable	2,902	1,808
Deferred income taxes	3,233	1,267
Total current assets	522,788	498,088
Property and equipment:
Land	3,653	3,260
Buildings and improvements	67,496	64,953
Computer hardware and software	76,105	67,714
Software development costs	32,699	27,482
Furniture and fixtures	36,133	35,164
Aircraft	35,866	31,524
Total property and equipment, gross	251,952	230,097
Accumulated depreciation and amortization	(159,008)	(154,070)
Total property and equipment, net	92,944	76,027
Other assets:
Prepaid health insurance	9,000	9,000
Deposits - health insurance	2,640	2,640
Deposits - workers' compensation	52,320	51,731
Goodwill and other intangible assets, net	28,433	21,251
Other assets	4,134	1,108
Total other assets	96,527	85,730
Total assets	712,259	659,845
Current liabilities:
Accounts payable	5,085	3,309
Payroll taxes and other payroll deductions payable	168,652	145,096
Accrued worksite employee payroll cost	130,317	109,697
Accrued health insurance costs	9,427	15,419
Accrued workers' compensation costs	46,548	42,081
Accrued corporate payroll and commissions	22,383	23,743
Other accrued liabilities	13,814	14,264
Total current liabilities	396,226	353,609
Noncurrent liabilities:
Accrued workers' compensation costs	60,054	55,730
Other accrued liabilities	0	1,261
Deferred income taxes	10,772	8,850
Total noncurrent liabilities	70,826	65,841
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 - 30,839 at December 31, 2011 and 2010	309	309
Additional paid-in capital	135,871	135,607
Treasury stock, at cost - 5,141 and 4,757 shares at December 31, 2011 and 2010, respectively	(134,647)	(124,464)
Accumulated other comprehensive income, net of tax	24	21
Retained earnings	243,650	228,922
Total stockholders' equity	245,207	240,395
Total liabilities and stockholders' equity	$ 712,259	$ 659,845