CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 863,435	$ 784,168
Short-term investments	442	446
Accounts receivable, less allowance for doubtful accounts of $5,200 and $5,200, respectively	82,498	91,579
Other receivables and current assets	172,304	200,233
Total current assets	1,118,679	1,076,426
Property and equipment, net	60,151	61,924
Goodwill	1,334,129	1,332,348
Other intangible assets, net	209,677	220,553
Other long-term assets	5,966	5,757
Deferred income taxes	30,226	32,896
Total assets	2,758,828	2,729,904
Current liabilities:
Accounts payable	4,302	4,865
Accrued bonuses and commissions	17,640	46,141
Accrued income taxes	16,790	4,695
Other accrued expenses and liabilities	60,952	63,801
Deferred revenue	375,140	364,644
Total current liabilities	474,824	484,146
Long-term liabilities:
Deferred income taxes	6,571	2,091
Other long-term liabilities	43,530	49,240
Total long-term liabilities	$ 50,101	$ 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	882,438	894,469
Retained earnings	1,848,497	1,792,029
Treasury stock, at cost: 5,262,278 and 5,096,505 shares, respectively	(456,871)	(440,839)
Accumulated other comprehensive loss	(41,093)	(52,164)
Total stockholders' equity	2,233,903	2,194,427
Total liabilities and stockholders' equity	$ 2,758,828	$ 2,729,904