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Fair Value Fair Value (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value [Abstract]  
Fair Value Measurements, Nonrecurring [Table Text Block]
The fair value of our senior notes is based on Level 1 inputs and was as follows at December 31, 2017 and 2016:
 
December 31, 2017
 
December 31, 2016
(In thousands)
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
$
292,740

 
$
278,835

 
$
(13,905
)
 
$
292,740

 
$
266,393

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

 
237,500

 
(12,500
)
 
250,000

 
206,250

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

 
$
516,335

 
$
(26,405
)
 
$
542,740

 
$
472,643

 
$
(70,097
)