Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 420,558	$ 569,299
Marketable securities, available for sale	798,603	895,777
Accounts receivable, net	81,842	85,517
Inventories	11,982	14,147
Prepaid expenses and other current assets	34,399	23,836
Total current assets	1,347,384	1,588,576
Restricted cash	129	130
Property and equipment, net	730,000	696,911
Goodwill	30,992	30,992
Other assets	9,315	2,432
Total assets	2,117,820	2,319,041
Current liabilities:
Accounts payable	55,363	49,327
Accrued expenses	237,789	271,077
Deferred revenues, current portion	27,174	21,510
Accrued restructuring expenses, current portion	8,498	14,286
Capital lease obligations, current portion	19,707	16,893
Other liabilities, current portion	14,442	24,736
Total current liabilities	362,973	397,829
Deferred revenues, excluding current portion	38,105	49,459
Accrued restructuring expenses, excluding current portion	10,486	14,067
Capital lease obligations, excluding current portion	45,053	48,754
Construction financing lease obligation, excluding current portion	473,268	440,937
Other liabilities, excluding current portion	15,666	11,590
Total liabilities	945,551	962,636
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; none issued and outstanding at June 30, 2014 and December 31, 2013	0	0
Common stock, $0.01 par value; 300,000,000 shares authorized at June 30, 2014 and December 31, 2013; 237,331,086 and 233,788,852 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	2,347	2,320
Additional paid-in capital	5,528,679	5,321,286
Accumulated other comprehensive loss	(23)	(306)
Accumulated deficit	(4,358,734)	(3,966,895)
Total shareholders’ equity	1,172,269	1,356,405
Total liabilities and shareholders’ equity	$ 2,117,820	$ 2,319,041