Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Summary Of Valuation Allowance) (Details)

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Income Taxes (Summary Of Valuation Allowance) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Valuation allowance at beginning of period $ 44,696 $ 17,296 $ 2,550
Increase of allowance to income tax provision 9,661 27,400 14,746
Valuation allowance at end of period $ 54,357 $ 44,696 $ 17,296