Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Current assets:    
Allowance for uncollectible accounts $ 592 $ 17
Short-term investments, at amortized cost 104,914 21,141
Long-term investments, at amortized cost 521,229 585,862
Restricted deposits, at amortized cost 26,697 22,755
Accumulated depreciation $ 166,442 $ 138,629
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 52,921,255 52,172,037
Common stock, shares outstanding (in shares) 50,377,774 49,616,824
Treasury stock, shares (in shares) 2,543,481 2,555,213