Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 230,926	$ 151,710
Accounts receivable	13,004	9,130
Prepaid expenses	26,643	17,854
Inventory	866	1,151
Income tax receivable	10,211	10,447
Deferred contract costs	71,559	60,819
Current assets before funds held for clients	353,209	251,111
Funds held for clients	2,959,973	1,613,494
Total current assets	3,313,182	1,864,605
Property and equipment, net	329,296	285,218
Intangible assets, net	59,057	319
Goodwill	51,889	51,889
Long-term deferred contract costs	430,761	371,357
Other assets	33,853	34,524
Total assets	4,218,038	2,607,912
Current liabilities:
Accounts payable	9,441	6,787
Accrued commissions and bonuses	12,431	13,703
Accrued payroll and vacation	36,138	24,529
Deferred revenue	16,175	13,567
Current portion of long-term debt	1,775	1,775
Accrued expenses and other current liabilities	50,340	44,175
Current liabilities before client funds obligation	126,300	104,536
Client funds obligation	2,959,973	1,613,494
Total current liabilities	3,086,273	1,718,030
Deferred income tax liabilities, net	125,228	112,598
Long-term deferred revenue	81,702	73,259
Net long-term debt, less current portion	27,815	29,119
Other long-term liabilities	71,679	19,263
Total long-term liabilities	306,424	234,239
Total liabilities	3,392,697	1,952,269
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value (100,000 shares authorized, 62,275 and 61,861 shares issued at September 30, 2021 and December 31, 2020, respectively; 57,997 and 57,739 shares outstanding at September 30, 2021 and December 31, 2020, respectively)	622	618
Additional paid-in capital	441,479	357,908
Retained earnings	866,892	719,619
Treasury stock, at cost (4,278 and 4,122 shares at September 30, 2021 and December 31, 2020, respectively)	(483,652)	(422,502)
Total stockholders’ equity	825,341	655,643
Total liabilities and stockholders’ equity	$ 4,218,038	$ 2,607,912