Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 360,594	$ 277,978
Accounts receivable	17,945	9,490
Prepaid expenses	28,588	23,729
Inventory	732	1,131
Income tax receivable		16,413
Deferred contract costs	82,074	76,724
Current assets before funds held for clients	489,933	405,465
Funds held for clients	3,944,363	1,846,573
Total current assets	4,434,296	2,252,038
Property and equipment, net	362,505	348,953
Intangible assets, net	56,999	58,028
Goodwill	51,889	51,889
Long-term deferred contract costs	493,530	461,852
Other assets	45,355	42,385
Total assets	5,444,574	3,215,145
Current liabilities:
Accounts payable	12,192	5,772
Income tax payable	23,180
Accrued commissions and bonuses	12,048	22,357
Accrued payroll and vacation	42,838	34,259
Deferred revenue	17,135	16,277
Current portion of long-term debt	1,775	1,775
Accrued expenses and other current liabilities	57,260	63,397
Current liabilities before client funds obligation	166,428	143,837
Client funds obligation	3,946,103	1,846,573
Total current liabilities	4,112,531	1,990,410
Deferred income tax liabilities, net	134,769	145,504
Long-term deferred revenue	87,681	85,149
Net long-term debt, less current portion	26,945	27,380
Other long-term liabilities	73,628	72,988
Total long-term liabilities	323,023	331,021
Total liabilities	4,435,554	2,321,431
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value (100,000 shares authorized, 62,302 and 62,298 shares issued at March 31, 2022 and December 31, 2021, respectively; 58,015 and 58,012 shares outstanding at March 31, 2022 and December 31, 2021, respectively)	623	623
Additional paid-in capital	490,307	465,594
Retained earnings	1,007,509	915,579
Accumulated other comprehensive earnings (loss)	(1,119)
Treasury stock, at cost (4,287 and 4,286 shares at March 31, 2022 and December 31, 2021, respectively)	(488,300)	(488,082)
Total stockholders’ equity	1,009,020	893,714
Total liabilities and stockholders’ equity	$ 5,444,574	$ 3,215,145