CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 966,278	$ 1,211,463
Accounts receivable, less allowance for doubtful accounts of approximately $5,065 and $6,469 as of June 30, 2018 and December 31, 2017, respectively	69,984	60,900
Prepaid expenses and other current assets	39,723	15,572
Total current assets	1,075,985	1,287,935
Long-term investments	10,070	10,070
Deferred income taxes, net	4,046	5,431
Property and equipment, net	84,648	84,496
Goodwill	1,549,517	1,283,457
Intangible assets, net	299,611	182,892
Deferred commission costs, net	76,159	0
Deposits and other assets	7,660	6,179
Income tax receivable	14,878	12,981
Total assets	3,122,574	2,873,441
Current liabilities:
Accounts payable	9,394	9,262
Accrued wages and commissions	45,593	54,104
Accrued expenses	37,343	22,193
Deferred gain on the sale of building	2,523	2,523
Income taxes payable	94	8,166
Deferred rent	4,632	4,732
Deferred revenue	46,341	45,686
Total current liabilities	145,920	146,666
Deferred gain on the sale of building	14,930	16,192
Deferred rent	32,230	33,909
Deferred income taxes, net	62,830	12,070
Income taxes payable	16,046	13,354
Total liabilities	271,956	222,191
Stockholders' equity:
Total stockholders’ equity	2,850,618	2,651,250
Total liabilities and stockholders’ equity	$ 3,122,574	$ 2,873,441