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Fair Value Fair Value (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and December 31, 2016:
 
September 30, 2017
 
December 31, 2016
(in thousands)
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
$
292,740

 
$
277,371

 
$
(15,369
)
 
$
292,740

 
$
266,393

 
$
(26,347
)
4.75% senior notes
250,000

 
226,250

 
(23,750
)
 
250,000

 
206,250

 
(43,750
)
Total senior notes
$
542,740

 
$
503,621

 
$
(39,119
)
 
$
542,740

 
$
472,643

 
$
(70,097
)