Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 368,152	$ 324,169
Marketable securities	383,849	512,849
Accounts receivable, net of reserves of $2,359 and $6,145 at September 30, 2017, and December 31, 2016, respectively	400,839	368,596
Prepaid expenses and other current assets	142,943	104,303
Total current assets	1,295,783	1,309,917
Property and equipment, net	883,754	801,017
Marketable securities	661,929	779,311
Goodwill	1,358,762	1,228,503
Acquired intangible assets, net	176,288	149,463
Deferred income tax assets	18,930	8,982
Other assets	113,688	95,953
Total assets	4,509,134	4,373,146
Current liabilities:
Accounts payable	88,339	76,120
Accrued expenses	267,966	238,777
Deferred revenue	64,716	52,972
Other current liabilities	9,285	6,719
Total current liabilities	430,306	374,588
Deferred revenue	4,224	3,758
Deferred income tax liabilities	15,984	11,652
Convertible senior notes	657,131	640,087
Other liabilities	128,834	118,691
Total liabilities	1,236,479	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; 175,549,867 shares issued and 169,726,509 shares outstanding at September 30, 2017, and 173,254,797 shares issued and outstanding at December 31, 2016	1,755	1,733
Additional paid-in capital	4,363,876	4,239,588
Accumulated other comprehensive loss	(24,833)	(56,222)
Treasury stock, at cost, 5,823,358 shares at September 30, 2017, and no shares at December 31, 2016	(306,628)	0
Accumulated deficit	(761,515)	(960,729)
Total stockholders’ equity	3,272,655	3,224,370
Total liabilities and stockholders’ equity	$ 4,509,134	$ 4,373,146