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Fair Value
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value
Note Q — Fair Value
We use a three-tier fair value hierarchy, which classifies the inputs used in measuring fair values, in determining the fair value of our non-financial assets and non-financial liabilities, which consist primarily of goodwill. These tiers include: Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. There were no changes in the methods and assumptions used in measuring fair value during the period.
At December 31, 2014, our financial instruments include cash and cash equivalents, receivables, payables, senior debt and senior notes. The carrying amount of cash and cash equivalents, receivables and payables approximates fair value at December 31, 2014 and 2013, because of the short maturities of these instruments. Our senior debt is variable rate debt that re-prices frequently and entails no significant change in credit risk and, as a result, fair value approximates carrying value.
The fair value of our senior notes is based on Level 1 inputs and was as follows at December 31, 2014 and 2013 (in thousands):
 
 
December 31, 2014
 
December 31, 2013
 
 
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
 
$
300,000

 
$
284,250

 
$
(15,750
)
 
$
300,000

 
$
316,700

 
$
16,700

4.75% senior notes
 
250,000

 
214,375

 
(35,625
)
 
250,000

 
234,700

 
(15,300
)
Total
 
$
550,000

 
$
498,625

 
$
(51,375
)
 
$
550,000

 
$
551,400

 
$
1,400