CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,100,416	$ 1,211,463
Accounts receivable, less allowance of $5,709 and $6,469 as of December 31, 2018 and December 31, 2017, respectively	89,192	60,900
Prepaid expenses and other current assets	23,690	15,572
Total current assets	1,213,298	1,287,935
Long-term investments	10,070	10,070
Deferred income taxes, net	7,469	5,431
Property and equipment, net	83,303	84,496
Goodwill	1,611,535	1,283,457
Intangible assets, net	288,911	182,892
Deferred commission costs, net	76,031	0
Deposits and other assets	7,432	6,179
Income tax receivable	14,908	12,981
Total assets	3,312,957	2,873,441
Current liabilities:
Accounts payable	6,327	9,262
Accrued wages and commissions	45,588	54,104
Accrued expenses	29,821	22,193
Deferred gain on the sale of building	2,523	2,523
Income taxes payable	14,288	8,166
Deferred rent	4,153	4,732
Deferred revenue	51,459	45,686
Total current liabilities	154,159	146,666
Deferred gain on the sale of building	13,669	16,192
Deferred rent	31,944	33,909
Deferred income taxes, net	69,857	12,070
Income taxes payable	17,386	13,354
Other long-term liabilities	4,000	0
Total liabilities	291,015	222,191
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.01 par value; 2,000 shares authorized; none outstanding	0	0
Common stock, $0.01 par value; 60,000 shares authorized; 36,446 and 36,107 issued and outstanding as of December 31, 2018 and 2017, respectively	364	361
Additional paid-in capital	2,419,812	2,339,253
Accumulated other comprehensive loss	(11,688)	(9,020)
Retained earnings	613,454	320,656
Total stockholders’ equity	3,021,942	2,651,250
Total liabilities and stockholders’ equity	$ 3,312,957	$ 2,873,441