Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 742,521	$ 393,745
Marketable securities	701,515	1,143,249
Accounts receivable, net of reserves of $3,696 and $1,880 at September 30, 2020, and December 31, 2019, respectively	630,406	551,943
Prepaid expenses and other current assets	168,779	142,676
Total current assets	2,243,221	2,231,613
Marketable securities	1,110,058	835,384
Property and equipment, net	1,383,480	1,152,153
Operating lease right-of-use assets	745,089	758,450
Acquired intangible assets, net	184,478	179,431
Goodwill	1,598,919	1,600,265
Deferred income tax assets	97,801	76,528
Other assets	151,347	173,062
Total assets	7,514,393	7,006,886
Current liabilities:
Accounts payable	114,850	138,946
Accrued expenses	369,815	334,861
Deferred revenue	88,942	71,223
Operating lease liabilities	136,292	139,463
Other current liabilities	7,225	8,843
Total current liabilities	717,124	693,336
Deferred revenue	3,954	4,368
Deferred income tax liabilities	31,946	29,187
Convertible senior notes	1,889,743	1,839,791
Operating lease liabilities	682,623	692,181
Other liabilities	81,386	90,065
Total liabilities	3,406,776	3,348,928
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 700,000 shares designated as Series A Junior Participating Preferred Stock; no shares issued or outstanding	0	0
Common stock, $0.01 par value; 700,000,000 shares authorized; 164,062,652 shares issued and 162,799,784 shares outstanding at September 30, 2020, and 162,000,843 shares issued and outstanding at December 31, 2019	1,641	1,620
Additional paid-in capital	3,781,228	3,653,486
Accumulated other comprehensive loss	(45,854)	(45,144)
Treasury stock, at cost, 1,262,868 shares at September 30, 2020, and no shares at December 31, 2019	(121,078)	0
Retained earnings	491,680	47,996
Total stockholders’ equity	4,107,617	3,657,958
Total liabilities and stockholders’ equity	7,514,393	7,006,886
Accounts receivable reserve	$ 3,696	$ 1,880
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares designated as Series A Junior Participating Preferred Stock (in shares)	700,000	700,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares issued (in shares)	164,062,652	162,000,843
Common stock, shares outstanding (in shares)	162,799,784	162,000,843
Treasury stock (in shares)	1,262,868	0