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Financial Instruments and Fair Values
6 Months Ended
Jun. 30, 2011
Financial Instruments and Fair Values [Abstract]  
Financial Instruments and Fair Values
 
4.
Financial Instruments and Fair Values
 
The fair value of a financial instrument represents the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale.  Fair value estimates are made at a specific point in time, based upon relevant market information about the financial instrument.
 
The carrying amount of cash and other assets approximates fair value due to the short-term maturities of these instruments.
 
The fair values of all other financial instruments, including debt, approximate their book values as the instruments are short-term in nature or contain market rates of interest.