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Fair Value Fair Value (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Nonrecurring
The fair value of our senior notes is based on Level 1 inputs and was as follows at December 31, 2015 and 2014 (in thousands):
 
 
December 31, 2015
 
December 31, 2014
 
 
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
 
$
292,740

 
$
248,097

 
$
(44,643
)
 
$
300,000

 
$
284,250

 
$
(15,750
)
4.75% senior notes
 
250,000

 
183,125

 
(66,875
)
 
250,000

 
214,375

 
(35,625
)
Total
 
$
542,740

 
$
431,222

 
$
(111,518
)
 
$
550,000

 
$
498,625

 
$
(51,375
)