Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 202,362	$ 151,710
Accounts receivable	19,905	9,130
Prepaid expenses	32,284	17,854
Inventory	882	1,151
Income tax receivable	7,997	10,447
Deferred contract costs	67,720	60,819
Current assets before funds held for clients	331,150	251,111
Funds held for clients	2,025,372	1,613,494
Total current assets	2,356,522	1,864,605
Property and equipment, net	320,997	285,218
Intangible assets, net	60,087	319
Goodwill	51,889	51,889
Long-term deferred contract costs	410,700	371,357
Other assets	32,892	34,524
Total assets	3,233,087	2,607,912
Current liabilities:
Accounts payable	9,220	6,787
Accrued commissions and bonuses	9,918	13,703
Accrued payroll and vacation	28,640	24,529
Deferred revenue	14,946	13,567
Current portion of long-term debt	1,775	1,775
Accrued expenses and other current liabilities	55,337	44,175
Current liabilities before client funds obligation	119,836	104,536
Client funds obligation	2,025,372	1,613,494
Total current liabilities	2,145,208	1,718,030
Deferred income tax liabilities, net	119,083	112,598
Long-term deferred revenue	77,512	73,259
Net long-term debt, less current portion	28,250	29,119
Other long-term liabilities	70,778	19,263
Total long-term liabilities	295,623	234,239
Total liabilities	2,440,831	1,952,269
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value (100,000 shares authorized, 62,135 and 61,861 shares issued at June 30, 2021 and December 31, 2020, respectively; 57,918 and 57,739 shares outstanding at June 30, 2021 and December 31, 2020, respectively)	621	618
Additional paid-in capital	409,979	357,908
Retained earnings	836,513	719,619
Treasury stock, at cost (4,217 and 4,122 shares at June 30, 2021 and December 31, 2020, respectively)	(454,857)	(422,502)
Total stockholders’ equity	792,256	655,643
Total liabilities and stockholders’ equity	$ 3,233,087	$ 2,607,912