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Fair Value Fair Value (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018 and December 31, 2017:
 
March 31, 2018
 
December 31, 2017
(in thousands)
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
$
292,740

 
$
266,774

 
$
(25,966
)
 
$
292,740

 
$
278,835

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

 
221,575

 
(28,425
)
 
250,000

 
237,500

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

 
$
488,349

 
$
(54,391
)
 
$
542,740

 
$
516,335

 
$
(26,405
)