CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 744,546	$ 872,094
Short-term investments	433	288
Accounts receivable, less allowance for doubtful accounts of $13,400 and $8,700, respectively	343,247	433,479
Other receivables and current assets	206,038	249,619
Total current assets	1,294,264	1,555,480
Long-term assets:
Property and equipment, net	88,792	83,636
Operating lease right-of-use assets	117,242	105,671
Goodwill	2,474,299	2,413,280
Other intangible assets, net	481,694	476,711
Other long-term assets	191,326	180,032
Deferred income taxes	24,249	24,077
Total long-term assets	3,377,602	3,283,407
Total assets	4,671,866	4,838,887
Current liabilities:
Accounts payable	10,505	14,298
Accrued bonuses and commissions	37,642	101,546
Accrued income taxes	28,291	9,996
Current portion of long-term debt	0	75,000
Other accrued expenses and liabilities	142,270	142,947
Deferred revenue	325,098	351,353
Total current liabilities	543,806	695,140
Long-term liabilities:
Deferred income taxes	66,661	78,643
Long-term operating lease liabilities	103,585	91,768
Long-term debt	423,683	423,531
Other long-term liabilities	96,083	96,426
Total long-term liabilities	690,012	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	1,144,193	1,188,939
Retained earnings	3,513,334	3,370,706
Treasury stock, at cost: 8,889,945 and 8,893,177 shares, respectively	(1,141,040)	(1,041,831)
Accumulated other comprehensive loss	(79,385)	(65,381)
Total stockholders' equity	3,438,048	3,453,379
Total liabilities and stockholders' equity	$ 4,671,866	$ 4,838,887