CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 180,590	$ 211,208
Restricted cash	44,580	44,737
Marketable securities	57,182	56,987
Accounts receivable, net:
Trade	2,765	7,893
Unbilled	166,030	158,508
Other	7,633	4,532
Prepaid insurance	18,152	21,300
Other current assets	8,133	11,488
Income taxes receivable	0	2,902
Deferred income taxes	2,851	3,233
Total current assets	487,916	522,788
Property and equipment:
Land	3,653	3,653
Buildings and improvements	69,255	67,496
Computer hardware and software	79,460	76,105
Software development costs	34,347	32,699
Furniture and fixtures	36,489	36,133
Aircraft	35,879	35,866
Property and equipment, gross	259,083	251,952
Accumulated depreciation and amortization	(165,592)	(159,008)
Total property and equipment, net	93,491	92,944
Other assets:
Prepaid health insurance	9,000	9,000
Deposits - health insurance	2,840	2,640
Deposits - workers' compensation	56,377	52,320
Goodwill and other intangible assets, net	27,565	28,433
Other assets	4,868	4,134
Total other assets	100,650	96,527
Total assets	682,057	712,259
Current liabilities:
Accounts payable	2,873	5,085
Payroll taxes and other payroll deductions payable	122,590	168,652
Accrued worksite employee payroll cost	144,885	130,317
Accrued health insurance costs	9,868	9,427
Accrued workers' compensation costs	45,320	46,548
Accrued corporate payroll and commissions	13,474	22,383
Other accrued liabilities	14,008	13,814
Income taxes payable	1,429	0
Total current liabilities	354,447	396,226
Noncurrent liabilities:
Accrued workers' compensation costs	63,664	60,054
Deferred income taxes	11,414	10,772
Total noncurrent liabilities	75,078	70,826
Stockholders' equity:
Common stock	309	309
Additional paid-in capital	136,762	135,871
Treasury stock, at cost	(139,467)	(134,647)
Accumulated other comprehensive income,net of tax	58	24
Retained earnings	254,870	243,650
Total stockholders' equity	252,532	245,207
Total liabilities and stockholders' equity	$ 682,057	$ 712,259