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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 465,851 $ 231,945
Marketable securities 1,948,900 1,565,962
Other current assets 31,402 44,435
Total current assets 2,446,153 1,842,342
Property and equipment, net 263,513 266,125
Goodwill 52,527 52,527
Long-term deferred tax assets 15,392 9,385
Deposits Assets, Noncurrent 145,000 145,000
Other long-term assets 18,603 19,193
Total long-term assets 495,035 492,230
Total assets 2,941,188 2,334,572
Current liabilities:    
Accounts payable and accrued liabilities 219,603 203,920
Deferred revenues 713,309 688,265
Convertible Debentures, including contingent interest derivative 627,616 629,764
Total current liabilities 1,560,528 1,521,949
Long-term deferred revenues 286,097 287,424
Senior Notes 1,782,529 1,237,189
Deferred Tax Liabilities, Net, Noncurrent 444,108 371,433
Other long-term tax liabilities 128,197 117,172
Total long-term liabilities 2,640,931 2,013,218
Total liabilities 4,201,459 3,535,167
Commitments and contingencies
Stockholders' deficit:    
Preferred stock 0 0
Common stock 325 324
Additional paid-in capital 16,437,135 16,987,488
Accumulated deficit (17,694,790) (18,184,954)
Accumulated other comprehensive loss (2,941) (3,453)
Total stockholders' deficit (1,260,271) (1,200,595)
Total liabilities and stockholders' deficit $ 2,941,188 $ 2,334,572