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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Fair value of senior notes
Based upon quoted market prices as of December 31, 2013, 2012 and 2011, the fair value and carrying value of our senior notes was as follows (in millions):
 
December 31, 2013
 
December 31, 2012
 
December 31, 2011
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
7.125% senior notes due in 2017
$
256.7

 
$
250.0

 
$
258.1

 
$
250.0

 
$
254.8

 
$
250.0

8.875% senior notes due in 2020
$
239.1

 
$
222.4

 
$
244.4

 
$
222.1

 
$
239.6

 
$
221.9

7.875% senior notes due in 2022
$
409.0

 
$
404.9

 
$
424.0

 
$
405.4

 
$
252.8

 
$
247.9
Fair value of plan assets
The following table presents our assets that are measured at fair value as of December 31, 2013, and are categorized using the fair value hierarchy. For additional discussion related to the fair value of the Company's derivatives, refer to Note 1 of these consolidated financial statements. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value (in millions):
 
Fair Value Measurements at
 
Total
 
Quoted Prices in
Active markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
 (Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
December 31, 2013
 

 
 

 
 

 
 

Assets:
 
 
 
 
 
 
 
   Natural Gas Derivatives
$
0.5

 
$
—

 
$
0.5

 
$
—

   Oil Derivatives
$
0.3

 
$
—

 
$
0.3

 
$
—

Liabilities
 
 
 
 
 
 
 
   Natural Gas Derivatives
$
0.7

 
$
—

 
$
0.7

 
$
—

   Oil Derivatives
$
0.2

 
$
—

 
$
0.2

 
$
—