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Debt (Summary Of The Derivative Financial Instruments Held) (Details) (USD $)
Sep. 30, 2012
contract
Dec. 31, 2011
contract
Count 3 3
Notional values $ 31,595,000 $ 32,091,000
Fair value 1,841,000 2,053,000
Cedar/Rio Can Joint Venture [Member]
   
Count 1 1
Notional values 13,892,000 14,182,000
Fair value $ 2,235,000 $ 2,419,000