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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 354,260 | $ 286,034
Restricted cash | 41,137 | 42,637
Marketable securities | 1,960 | 1,851
Accounts receivable, net: |  |
Trade | 12,292 | 13,107
Unbilled | 318,431 | 254,999
Other | 3,258 | 2,178
Prepaid insurance | 10,782 | 15,041
Other current assets | 26,991 | 19,526
Income Taxes Receivable, Current | 9,824 | 4,949
Total current assets | 778,935 | 640,322
Property and equipment: |  |
Land | 6,215 | 5,214
Buildings and improvements | 95,615 | 90,151
Computer hardware and software | 105,060 | 97,311
Software development costs | 60,568 | 51,956
Furniture, fixtures and other | 42,891 | 38,483
Total property and equipment, gross | 310,349 | 283,115
Accumulated depreciation and amortization | (214,690) | (202,854)
Total property and equipment, net | 95,659 | 80,261
Other assets: |  |
Prepaid health insurance | 9,000 | 9,000
Deposits – health insurance | 5,300 | 4,700
Deposits – workers’ compensation | 154,215 | 143,938
Goodwill and other intangible assets, net | 12,762 | 13,088
Deferred income taxes, net | 4,283 | 14,025
Other assets | 3,541 | 1,840
Total other assets | 189,101 | 186,591
Total assets | 1,063,695 | 907,174
Current liabilities: |  |
Accounts payable | 6,447 | 4,189
Payroll taxes and other payroll deductions payable | 303,247 | 247,766
Accrued worksite employee payroll cost | 267,402 | 215,214
Accrued health insurance costs | 26,075 | 26,360
Accrued workers’ compensation costs | 42,974 | 44,231
Accrued corporate payroll and commissions | 52,595 | 40,761
Other accrued liabilities | 27,741 | 22,437
Total current liabilities | 726,481 | 600,958
Noncurrent liabilities: |  |
Accrued workers’ compensation costs | 166,493 | 141,291
Long-term debt | 104,400 | 104,400
Total noncurrent liabilities | 270,893 | 245,691
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 - 55,489 at December 31, 2017 and 2016 | 555 | 555
Additional paid-in capital | 25,337 | 8,962
Treasury stock, at cost – 14,009 and 13,438 at December 31, 2017 and 2016, respectively | (256,363) | (227,152)
Accumulated other comprehensive income, net of tax | (5) | (3)
Retained earnings | 296,797 | 278,163
Total stockholders’ equity | 66,321 | 60,525
Total liabilities and stockholders’ equity | $ 1,063,695 | $ 907,174

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