Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 277,978	$ 151,710
Accounts receivable	9,490	9,130
Prepaid expenses	23,729	17,854
Inventory	1,131	1,151
Income tax receivable	16,413	10,447
Deferred contract costs	76,724	60,819
Current assets before funds held for clients	405,465	251,111
Funds held for clients	1,846,573	1,613,494
Total current assets	2,252,038	1,864,605
Property and equipment, net	348,953	285,218
Intangible assets, net	58,028	319
Goodwill	51,889	51,889
Long-term deferred contract costs	461,852	371,357
Other assets	42,385	34,524
Total assets	3,215,145	2,607,912
Current liabilities:
Accounts payable	5,772	6,787
Accrued commissions and bonuses	22,357	13,703
Accrued payroll and vacation	34,259	24,529
Deferred revenue	16,277	13,567
Current portion of long-term debt	1,775	1,775
Accrued expenses and other current liabilities	63,397	44,175
Current liabilities before client funds obligation	143,837	104,536
Client funds obligation	1,846,573	1,613,494
Total current liabilities	1,990,410	1,718,030
Deferred income tax liabilities, net	145,504	112,598
Long-term deferred revenue	85,149	73,259
Net long-term debt, less current portion	27,380	29,119
Other long-term liabilities	72,988	19,263
Total long-term liabilities	331,021	234,239
Total liabilities	2,321,431	1,952,269
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value (100,000 shares authorized, 62,298 and 61,861 shares issued at December 31, 2021 and December 31, 2020, respectively; 58,012 and 57,739 shares outstanding at December 31, 2021 and December 31, 2020, respectively)	623	618
Additional paid-in capital	465,594	357,908
Retained earnings	915,579	719,619
Treasury stock, at cost (4,286 and 4,122 shares at December 31, 2021 and December 31, 2020, respectively)	(488,082)	(422,502)
Total stockholders’ equity	893,714	655,643
Total liabilities and stockholders’ equity	$ 3,215,145	$ 2,607,912