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Debt (Summary Of The Derivative Financial Instruments Held) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Count 3 3
Notional values $ 31,761,000 $ 32,091,000
Fair value 1,925,000 2,053,000
Cedar/Rio Can Joint Venture [Member]
   
Count 1 1
Notional values 13,991,000 14,182,000
Fair value $ 2,334,000 $ 2,419,000