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Financial Instruments and Fair Values
3 Months Ended
Mar. 31, 2013
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 cash equivalents, prepaid expenses 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.