CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 354,641	$ 354,260
Restricted cash	41,137	41,137
Marketable securities	1,928	1,960
Accounts receivable, net:
Trade	3,923	12,292
Unbilled	329,672	318,431
Other	2,953	3,258
Prepaid insurance	35,679	10,782
Other current assets	28,385	26,991
Income taxes receivable	2,695	9,824
Total current assets	801,013	778,935
Property and equipment:
Land	6,215	6,215
Buildings and improvements	96,972	95,615
Computer hardware and software	106,847	105,060
Software development costs	62,385	60,568
Furniture, fixtures and other	43,393	42,891
Total property and equipment, gross	315,812	310,349
Accumulated depreciation and amortization	(218,752)	(214,690)
Total property and equipment, net	97,060	95,659
Other assets:
Prepaid health insurance	9,000	9,000
Deposits – health insurance	5,300	5,300
Deposits – workers’ compensation	160,840	154,215
Goodwill and other intangible assets, net	12,741	12,762
Deferred income taxes, net	0	4,283
Other assets	5,513	3,541
Total other assets	193,394	189,101
Total assets	1,091,467	1,063,695
Current liabilities:
Accounts payable	5,517	6,447
Payroll taxes and other payroll deductions payable	276,573	303,247
Accrued worksite employee payroll cost	281,474	267,402
Accrued health insurance costs	46,795	26,075
Accrued workers’ compensation costs	43,788	42,974
Accrued corporate payroll and commissions	27,785	52,595
Other accrued liabilities	27,697	27,741
Total current liabilities	709,629	726,481
Noncurrent liabilities:
Accrued workers’ compensation costs	171,773	166,493
Long-term debt	104,400	104,400
Deferred income taxes, net	2,833	0
Total noncurrent liabilities	279,006	270,893
Commitments and contingencies
Stockholders’ equity:
Common stock	555	555
Additional paid-in capital	22,648	25,337
Treasury stock, at cost	(257,898)	(256,363)
Retained earnings	337,527	296,792
Total stockholders’ equity	102,832	66,321
Total liabilities and stockholders’ equity	$ 1,091,467	$ 1,063,695