CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 822,479	$ 784,168
Short-term investments	381	446
Accounts receivable, less allowance for doubtful accounts of $5,700 and $5,200, respectively	107,192	91,579
Other receivables and current assets	239,349	200,233
Total current assets	1,169,401	1,076,426
Property and equipment, net	54,677	61,924
Goodwill	1,337,215	1,332,348
Other intangible assets, net	172,619	220,553
Other long-term assets	24,287	5,757
Deferred income taxes	42,327	32,896
Total assets	2,800,526	2,729,904
Current liabilities:
Accounts payable	7,395	4,865
Accrued bonuses and commissions	49,487	46,141
Accrued income taxes	5,263	4,695
Other accrued expenses and liabilities	73,676	63,801
Deferred revenue	403,279	364,644
Total current liabilities	539,100	484,146
Long-term liabilities:
Deferred income taxes	2,259	2,091
Other long-term liabilities	50,762	49,240
Total long-term liabilities	53,021	51,331
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized; zero shares issued or outstanding	0	0
Common stock, $.01 par value; 300,000,000 shares authorized; 93,236,023 shares issued	932	932
Additional paid-in capital	883,010	894,469
Retained earnings	2,057,665	1,792,029
Treasury stock, at cost: 7,548,188 and 5,096,505 shares, respectively	(675,550)	(440,839)
Accumulated other comprehensive loss	(57,652)	(52,164)
Total stockholders’ equity	2,208,405	2,194,427
Total liabilities and stockholders’ equity	$ 2,800,526	$ 2,729,904