CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 844,741	$ 872,094
Short-term investments	468	288
Accounts receivable, less allowance for doubtful accounts of $13,400 and $8,700, respectively	371,352	433,479
Other receivables and current assets	242,160	249,619
Total current assets	1,458,721	1,555,480
Long-term assets:
Property and equipment, net	90,299	83,636
Operating lease right-of-use assets	115,705	105,671
Goodwill	2,491,590	2,413,280
Other intangible assets, net	474,785	476,711
Other long-term assets	189,227	180,032
Deferred income taxes	25,968	24,077
Total long-term assets	3,387,574	3,283,407
Total assets	4,846,295	4,838,887
Current liabilities:
Accounts payable	10,578	14,298
Accrued bonuses and commissions	52,352	101,546
Accrued income taxes	29,570	9,996
Current portion of long-term debt	0	75,000
Other accrued expenses and liabilities	142,856	142,947
Deferred revenue	326,491	351,353
Total current liabilities	561,847	695,140
Long-term liabilities:
Deferred income taxes	63,729	78,643
Long-term operating lease liabilities	101,941	91,768
Long-term debt	423,759	423,531
Other long-term liabilities	105,406	96,426
Total long-term liabilities	694,835	690,368
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; 94,627,585 shares issued	946	946
Additional paid-in capital	1,182,127	1,188,939
Retained earnings	3,588,961	3,370,706
Treasury stock, at cost: 8,774,080 and 8,893,177 shares, respectively	(1,131,084)	(1,041,831)
Accumulated other comprehensive loss	(51,337)	(65,381)
Total stockholders' equity	3,589,613	3,453,379
Total liabilities and stockholders' equity	$ 4,846,295	$ 4,838,887