Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 522,319	$ 324,169
Marketable securities	322,750	512,849
Accounts receivable, net of reserves of $1,134 and $6,145 at March 31, 2017, and December 31, 2016, respectively	400,792	368,596
Prepaid expenses and other current assets	152,600	104,303
Total current assets	1,398,461	1,309,917
Property and equipment, net	824,724	801,017
Marketable securities	739,065	779,311
Goodwill	1,229,504	1,228,503
Acquired intangible assets, net	141,894	149,463
Deferred income tax assets	7,332	8,982
Other assets	109,015	95,953
Total assets	4,449,995	4,373,146
Current liabilities:
Accounts payable	90,179	76,120
Accrued expenses	218,028	238,777
Deferred revenue	63,434	52,972
Other current liabilities	10,235	6,719
Total current liabilities	381,876	374,588
Deferred revenue	4,505	3,758
Deferred income tax liabilities	39,902	11,652
Convertible senior notes	645,719	640,087
Other liabilities	119,447	118,691
Total liabilities	1,191,449	1,148,776
Commitments and contingencies (Note 7)
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; 174,290,998 shares issued and 173,189,385 shares outstanding at March 31, 2017, and 173,254,797 shares issued and outstanding at December 31, 2016	1,743	1,733
Additional paid-in capital	4,254,982	4,239,588
Accumulated other comprehensive loss	(45,913)	(56,222)
Treasury stock, at cost, 1,101,613 shares at March 31, 2017, and no shares at December 31, 2016	(72,467)	0
Accumulated deficit	(879,799)	(960,729)
Total stockholders’ equity	3,258,546	3,224,370
Total liabilities and stockholders’ equity	$ 4,449,995	$ 4,373,146