CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 303,850	$ 286,034
Restricted cash	42,458	42,637
Marketable securities	1,841	1,851
Accounts receivable, net:
Trade	4,806	13,107
Unbilled	255,734	254,999
Other	3,595	2,178
Prepaid insurance	15,097	15,041
Other current assets	23,095	19,526
Income taxes receivable	0	4,949
Total current assets	650,476	640,322
Property and equipment:
Land	5,214	5,214
Buildings and improvements	94,038	90,151
Computer hardware and software	98,660	97,311
Software development costs	54,030	51,956
Furniture, fixtures and other	40,685	38,483
Total property and equipment, gross	292,627	283,115
Accumulated depreciation and amortization	(204,954)	(202,854)
Total property and equipment, net	87,673	80,261
Other assets:
Prepaid health insurance	9,000	9,000
Deposits – health insurance	4,700	4,700
Deposits – workers’ compensation	150,441	143,938
Goodwill and other intangible assets, net	12,963	13,088
Deferred income taxes, net	10,297	14,025
Other assets	2,978	1,840
Total other assets	190,379	186,591
Total assets	928,528	907,174
Current liabilities:
Accounts payable	4,542	4,189
Payroll taxes and other payroll deductions payable	249,847	247,766
Accrued worksite employee payroll cost	217,188	215,214
Accrued health insurance costs	24,043	26,360
Accrued workers’ compensation costs	44,283	44,231
Accrued corporate payroll and commissions	16,821	40,761
Other accrued liabilities	25,555	22,437
Income taxes payable	8,668	0
Total current liabilities	590,947	600,958
Noncurrent liabilities:
Accrued workers’ compensation costs	146,794	141,291
Long-term debt	104,400	104,400
Total noncurrent liabilities	251,194	245,691
Commitments and contingencies
Stockholders’ equity:
Common stock	277	277
Additional paid-in capital	11,817	9,240
Treasury stock, at cost	(234,225)	(227,152)
Retained earnings	308,518	278,160
Total stockholders’ equity	86,387	60,525
Total liabilities and stockholders’ equity	$ 928,528	$ 907,174