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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]    
Valuation allowance at beginning of period $ 72,000 $ 61,933
Decrease of allowance to income tax provision 55,361 10,067
Valuation allowance at end of period $ 127,361 $ 72,000