CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 843,355	$ 784,168
Short-term investments	410	446
Accounts receivable, less allowance for doubtful accounts of $5,100 and $5,200, respectively	85,506	91,579
Other receivables and current assets	180,471	200,233
Total current assets	1,109,742	1,076,426
Property and equipment, net	58,095	61,924
Goodwill	1,333,397	1,332,348
Other intangible assets, net	196,933	220,553
Other long-term assets	16,926	5,757
Deferred income taxes	32,568	32,896
Total assets	2,747,661	2,729,904
Current liabilities:
Accounts payable	4,218	4,865
Accrued bonuses and commissions	23,929	46,141
Accrued income taxes	3,124	4,695
Other accrued expenses and liabilities	60,637	63,801
Deferred revenue	375,802	364,644
Total current liabilities	467,710	484,146
Long-term liabilities:
Deferred income taxes	2,160	2,091
Other long-term liabilities	41,931	49,240
Total long-term liabilities	44,091	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	884,675	894,469
Retained earnings	1,918,125	1,792,029
Treasury stock, at cost: 6,078,052 and 5,096,505 shares, respectively	(527,931)	(440,839)
Accumulated other comprehensive loss	(39,941)	(52,164)
Total stockholders' equity	2,235,860	2,194,427
Total liabilities and stockholders' equity	$ 2,747,661	$ 2,729,904