Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 228,659	$ 191,608
Marketable securities	1,686,771	1,233,076
Accounts receivable, net	12,638	13,448
Other current assets	39,856	41,658
Total current assets	1,967,924	1,479,790
Property and equipment, net	295,570	319,028
Goodwill	52,527	52,527
Long-term deferred tax assets	17,361	33,887
Other long-term assets	24,355	15,918
Total long-term assets	389,813	421,360
Total assets	2,357,737	1,901,150
Current liabilities:
Accounts payable and accrued liabilities	188,171	190,278
Deferred revenues	680,483	621,307
Convertible Debentures, including contingent interest derivative	634,326	620,620
Total current liabilities	1,502,980	1,432,205
Long-term deferred revenues	280,859	269,047
Senior Notes	1,235,354	740,175
Deferred Tax Liabilities, Net, Noncurrent	294,194	244,467
Other long-term tax liabilities	114,797	98,722
Total long-term liabilities	1,925,204	1,352,411
Total liabilities	$ 3,428,184	$ 2,784,616
Commitments and contingencies
Stockholders' deficit:
Preferred stock	$ 0	$ 0
Common stock	323	322
Additional paid-in capital	17,558,822	18,120,045
Accumulated deficit	(18,625,599)	(19,000,835)
Accumulated other comprehensive loss	(3,993)	(2,998)
Total stockholders' deficit	(1,070,447)	(883,466)
Total liabilities and stockholders' deficit	$ 2,357,737	$ 1,901,150