Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 279,039	$ 277,978
Accounts receivable	20,078	9,490
Prepaid expenses	37,779	23,729
Inventory	1,647	1,131
Income tax receivable	220	16,413
Deferred contract costs	86,048	76,724
Current assets before funds held for clients	424,811	405,465
Funds held for clients	3,423,181	1,846,573
Total current assets	3,847,992	2,252,038
Property and equipment, net	374,940	348,953
Intangible assets, net	55,969	58,028
Goodwill	51,889	51,889
Long-term deferred contract costs	511,957	461,852
Other assets	48,956	42,385
Total assets	4,891,703	3,215,145
Current liabilities:
Accounts payable	13,475	5,772
Accrued commissions and bonuses	14,798	22,357
Accrued payroll and vacation	41,802	34,259
Deferred revenue	17,920	16,277
Current portion of long-term debt		1,775
Accrued expenses and other current liabilities	54,904	63,397
Current liabilities before client funds obligation	142,899	143,837
Client funds obligation	3,425,573	1,846,573
Total current liabilities	3,568,472	1,990,410
Deferred income tax liabilities, net	135,282	145,504
Long-term deferred revenue	90,960	85,149
Net long-term debt, less current portion	29,000	27,380
Other long-term liabilities	73,850	72,988
Total long-term liabilities	329,092	331,021
Total liabilities	3,897,564	2,321,431
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value (100,000 shares authorized, 62,514 and 62,298 shares issued at June 30, 2022 and December 31, 2021, respectively; 57,864 and 58,012 shares outstanding at June 30, 2022 and December 31, 2021, respectively)	625	623
Additional paid-in capital	517,777	465,594
Retained earnings	1,064,864	915,579
Accumulated other comprehensive earnings (loss)	(1,600)
Treasury stock, at cost 4,650 and 4,286 shares at June 30, 2022 and December 31, 2021, respectively)	(587,527)	(488,082)
Total stockholders’ equity	994,139	893,714
Total liabilities and stockholders’ equity	$ 4,891,703	$ 3,215,145