Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 34,248	$ 30,423
Short-term investments, including restricted investments of $430	162,915	192,785
Accounts receivable, net of allowances of $35	863	1,378
Prepaid expenses and other current assets	8,438	6,349
Total current assets	206,464	230,935
Property and equipment, net of accumulated depreciation and amortization of $80,882 and $83,416, respectively	42,623	42,634
Goodwill	44,543	44,543
Other intangible assets	53,557	53,557
Other assets	88	109
Total assets	347,275	371,778
Current liabilities:
Accounts payable	5,442	7,661
Accrued liabilities	9,704	8,922
Current portion of deferred revenue	628	128
Current portion of long-term debt	1,607	1,574
Total current liabilities	17,381	18,285
Deferred revenue, net of current portion	13,405	13,910
Long-term debt	21,457	21,877
Deferred tax liabilities	18,745	18,745
Other long-term liabilities	34,079	32,283
Total liabilities	105,067	105,100
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.001 par value; 900,000 shares authorized; 513,835 and 512,375 shares issued, respectively	514	512
Additional paid-in capital	1,168,961	1,166,605
Accumulated deficit	(925,806)	(899,832)
Accumulated other comprehensive gain	42	23
Treasury stock, at cost, 814 and 380 shares, respectively	(1,503)	(630)
Total equity	242,208	266,678
Total liabilities and equity	$ 347,275	$ 371,778