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Fair Value Fair Value (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
December 31, 2018
 
December 31, 2017
(In thousands)
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
$
292,740

 
$
285,509

 
$
(7,231
)
 
$
292,740

 
$
278,835

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

 
239,050

 
(10,950
)
 
250,000

 
237,500

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

 
$
524,559

 
$
(18,181
)
 
$
542,740

 
$
516,335

 
$
(26,405
)