Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 352,501	$ 324,169
Marketable securities	330,620	512,849
Accounts receivable, net of reserves of $1,389 and $6,145 at June 30, 2017, and December 31, 2016, respectively	395,865	368,596
Prepaid expenses and other current assets	159,371	104,303
Total current assets	1,238,357	1,309,917
Property and equipment, net	856,039	801,017
Marketable securities	731,781	779,311
Goodwill	1,356,623	1,228,503
Acquired intangible assets, net	184,041	149,463
Deferred income tax assets	7,448	8,982
Other assets	114,750	95,953
Total assets	4,489,039	4,373,146
Current liabilities:
Accounts payable	91,741	76,120
Accrued expenses	222,023	238,777
Deferred revenue	73,772	52,972
Other current liabilities	11,528	6,719
Total current liabilities	399,064	374,588
Deferred revenue	3,848	3,758
Deferred income tax liabilities	21,762	11,652
Convertible senior notes	651,400	640,087
Other liabilities	125,793	118,691
Total liabilities	1,201,867	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; 175,148,684 shares issued and 172,027,173 shares outstanding at June 30, 2017, and 173,254,797 shares issued and outstanding at December 31, 2016	1,751	1,733
Additional paid-in capital	4,317,583	4,239,588
Accumulated other comprehensive loss	(32,520)	(56,222)
Treasury stock, at cost, 3,121,511 shares at June 30, 2017, and no shares at December 31, 2016	(177,615)	0
Accumulated deficit	(822,027)	(960,729)
Total stockholders’ equity	3,287,172	3,224,370
Total liabilities and stockholders’ equity	$ 4,489,039	$ 4,373,146