Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 384,103	$ 393,745
Marketable securities	865,168	1,143,249
Accounts receivable, net of reserves of $3,181 and $1,880 at March 31, 2020, and December 31, 2019, respectively	613,809	551,943
Prepaid expenses and other current assets	151,504	142,676
Total current assets	2,014,584	2,231,613
Marketable securities	961,150	835,384
Property and equipment, net	1,180,550	1,152,153
Operating lease right-of-use assets	738,176	758,450
Acquired intangible assets, net	205,486	179,431
Goodwill	1,594,197	1,600,265
Deferred income tax assets	80,037	76,528
Other assets	173,776	173,062
Total assets	6,947,956	7,006,886
Current liabilities:
Accounts payable	114,100	138,946
Accrued expenses	265,442	334,861
Deferred revenue	99,101	71,223
Operating lease liabilities	141,876	139,463
Other current liabilities	9,728	8,843
Total current liabilities	630,247	693,336
Deferred revenue	4,182	4,368
Deferred income tax liabilities	29,049	29,187
Convertible senior notes	1,856,287	1,839,791
Operating lease liabilities	673,029	692,181
Other liabilities	82,944	90,065
Total liabilities	3,275,738	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; 163,047,883 shares issued and 162,176,589 shares outstanding at March 31, 2020, and 162,000,843 shares issued and outstanding at December 31, 2019	1,631	1,620
Additional paid-in capital	3,658,990	3,653,486
Accumulated other comprehensive loss	(78,995)	(45,144)
Treasury stock, at cost, 871,294 shares at March 31, 2020, and no shares at December 31, 2019	(80,550)	0
Retained earnings	171,142	47,996
Total stockholders’ equity	3,672,218	3,657,958
Total liabilities and stockholders’ equity	$ 6,947,956	$ 7,006,886