Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 108,127	$ 45,718
Accounts receivable	2,609	3,414
Prepaid expenses	12,724	7,658
Inventory	700	797
Income tax receivable	9,512	3,962
Deferred contract costs	43,385	35,286
Current assets before funds held for clients	177,057	96,835
Funds held for clients	835,918	967,787
Total current assets	1,012,975	1,064,622
Property and equipment, net	224,035	176,962
Goodwill	51,889	51,889
Long-term deferred contract costs	272,783	225,459
Other assets	30,345	2,994
Total assets	1,592,027	1,521,926
Current liabilities:
Accounts payable	4,693	6,288
Accrued commissions and bonuses	8,432	10,671
Accrued payroll and vacation	17,672	10,741
Deferred revenue	10,634	8,980
Current portion of long-term debt	1,775	1,775
Accrued expenses and other current liabilities	39,354	22,440
Current liabilities before client funds obligation	82,560	60,895
Client funds obligation	835,918	967,787
Total current liabilities	918,478	1,028,682
Deferred income tax liabilities, net	85,921	70,206
Long-term deferred revenue	62,731	55,671
Net long-term debt, less current portion	31,293	32,614
Other long-term liabilities	18,706
Total long-term liabilities	198,651	158,491
Total liabilities	1,117,129	1,187,173
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value (100,000 shares authorized, 61,346 and 60,747 shares issued at September 30, 2019 and December 31, 2018, respectively; 57,657 and 57,277 shares outstanding at September 30, 2019 and December 31, 2018, respectively)	612	607
Additional paid-in capital	250,853	203,680
Retained earnings	530,786	395,590
Treasury stock, at cost (3,688 and 3,470 shares at September 30, 2019 and December 31, 2018, respectively)	(307,353)	(265,124)
Total stockholders' equity	474,898	334,753
Total liabilities and stockholders' equity	$ 1,592,027	$ 1,521,926