Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Allowance for uncollectible accounts $ 639 $ 17
Short-term investments, amortized cost 129,232 21,141
Long-term investments, amortized cost 497,805 585,862
Restricted deposits, amortized cost 26,751 22,755
Accumulated depreciation $ 177,294 $ 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) 53,586,726 52,172,037
Common stock, shares outstanding (in shares) 50,864,618 49,616,824
Treasury stock, shares (in shares) 2,722,108 2,555,213