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Financial Instruments And Risk Management (Maturities Of Available-For-Sale Debt Securities At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Financial Instruments And Risk Management [Abstract]
Mature within one year	$ 32
Mature in one to five years	535
Mature in five years and later	23,187
Total fair value of available-for-sale securities debt maturities	$ 23,754

This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details