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Fair Value Fair Value (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30, 2018 and December 31, 2017:
 
September 30, 2018
 
December 31, 2017
(in thousands)
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
$
292,740

 
$
291,276

 
$
(1,464
)
 
$
292,740

 
$
278,835

 
$
(13,905
)
4.75% senior notes
250,000

 
252,950

 
2,950

 
250,000

 
237,500

 
(12,500
)
Total senior notes
$
542,740

 
$
544,226

 
$
1,486

 
$
542,740

 
$
516,335

 
$
(26,405
)