Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 572,288	$ 393,745
Marketable securities	800,321	1,143,249
Accounts receivable, net of reserves of $6,225 and $1,880 at June 30, 2020, and December 31, 2019, respectively	644,659	551,943
Prepaid expenses and other current assets	175,731	142,676
Total current assets	2,192,999	2,231,613
Marketable securities	1,018,835	835,384
Property and equipment, net	1,281,392	1,152,153
Operating lease right-of-use assets	736,465	758,450
Acquired intangible assets, net	194,951	179,431
Goodwill	1,595,304	1,600,265
Deferred income tax assets	61,310	76,528
Other assets	143,542	173,062
Total assets	7,224,798	7,006,886
Current liabilities:
Accounts payable	153,958	138,946
Accrued expenses	263,646	334,861
Deferred revenue	93,648	71,223
Operating lease liabilities	138,478	139,463
Other current liabilities	7,692	8,843
Total current liabilities	657,422	693,336
Deferred revenue	4,536	4,368
Deferred income tax liabilities	29,556	29,187
Convertible senior notes	1,872,937	1,839,791
Operating lease liabilities	673,678	692,181
Other liabilities	82,374	90,065
Total liabilities	3,320,503	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; 163,773,348 shares issued and 162,630,477 shares outstanding at June 30, 2020, and 162,000,843 shares issued and outstanding at December 31, 2019	1,638	1,620
Additional paid-in capital	3,734,787	3,653,486
Accumulated other comprehensive loss	(57,307)	(45,144)
Treasury stock, at cost, 1,142,871 shares at June 30, 2020, and no shares at December 31, 2019	(107,880)	0
Retained earnings	333,057	47,996
Total stockholders’ equity	3,904,295	3,657,958
Total liabilities and stockholders’ equity	$ 7,224,798	$ 7,006,886