CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 872,094	$ 777,139
Short-term investments	288	225
Accounts receivable, less allowance for doubtful accounts of $8,700 and $8,000, respectively	433,479	317,700
Other receivables and current assets	249,619	216,113
Total current assets	1,555,480	1,311,177
Long-term assets:
Property and equipment, net	83,636	61,655
Operating lease right-of-use assets	105,671
Goodwill	2,413,280	1,572,455
Other intangible assets, net	476,711	211,272
Other long-term assets	180,032	82,775
Deferred income taxes	24,077	26,630
Total long-term assets	3,283,407	1,954,787
Total assets	4,838,887	3,265,964
Current liabilities:
Accounts payable	14,298	7,953
Accrued bonuses and commissions	101,546	79,945
Accrued income taxes	9,996	8,726
Current portion of long-term debt	75,000	0
Other accrued expenses and liabilities	142,947	99,559
Deferred revenue	351,353	328,584
Total current liabilities	695,140	524,767
Long-term liabilities:
Deferred income taxes	78,643	30,077
Long-term operating lease liabilities	91,768
Long-term debt	423,531	0
Other long-term liabilities	96,426	61,573
Total long-term liabilities	690,368	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; 94,627,585 and 93,236,023 shares issued, respectively	946	932
Additional paid-in capital	1,188,939	867,462
Retained earnings	3,370,706	2,919,411
Treasury stock, at cost: 8,893,177 and 9,601,670 shares, respectively	(1,041,831)	(1,075,879)
Accumulated other comprehensive loss	(65,381)	(62,379)
Total stockholders’ equity	3,453,379	2,649,547
Total liabilities and stockholders’ equity	$ 4,838,887	$ 3,265,964