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Fair Value Measurements
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Fair Value Measurements
FAIR VALUE MEASUREMENTS
We have classified assets and liabilities required to be measured at fair value into the fair value hierarchy as set forth below:
Level 1
–    quoted prices in active markets for identical assets and liabilities.
Level 2
–    observable inputs other than quoted prices for identical assets and liabilities.
Level 3
–    unobservable inputs in which there is little or no market data available, which requires us to develop our own assumptions.
We measure our derivative instruments at fair value using Level 2 inputs. See Note 11 for additional information about our derivative instruments. There were no changes among the levels during the first six months of 2012.
 
The carrying amount of cash and cash equivalents, receivables and accounts payable approximates fair value due to their short-term nature. The fair value of outstanding debt, including current maturities, was approximately $227 million and $269 million at June 30, 2012, and December 31, 2011, respectively. These Level 2 fair value estimates were based on values of similar debt with the same maturities, debt rating and interest rates.