CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 732,684	$ 777,139
Short-term investments	218	225
Accounts receivable, less allowance for doubtful accounts of $8,700 and $8,000, respectively	295,590	317,700
Other receivables and current assets	177,734	216,113
Total current assets	1,206,226	1,311,177
Long-term assets:
Property and equipment, net	70,295	61,655
Operating lease right-of-use assets	104,160
Goodwill	1,771,862	1,572,455
Other intangible assets, net	267,378	211,272
Other long-term assets	134,757	82,775
Deferred income taxes	27,334	26,630
Total long-term assets	2,375,786	1,954,787
Total assets	3,582,012	3,265,964
Current liabilities:
Accounts payable	8,172	7,953
Accrued bonuses and commissions	55,362	79,945
Accrued income taxes	7,278	8,726
Other accrued expenses and liabilities	111,633	99,559
Deferred revenue	291,385	328,584
Total current liabilities	473,830	524,767
Long-term liabilities:
Deferred income taxes	31,201	30,077
Long-term operating lease liabilities	91,173
Other long-term liabilities	62,484	61,573
Total long-term liabilities	184,858	91,650
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	865,634	867,462
Retained earnings	3,204,854	2,919,411
Treasury stock, at cost: 9,072,210 and 9,601,670 shares, respectively	(1,057,955)	(1,075,879)
Accumulated other comprehensive loss	(90,141)	(62,379)
Total stockholders' equity	2,923,324	2,649,547
Total liabilities and stockholders' equity	$ 3,582,012	$ 3,265,964