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Fair Value Fair Value (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [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, 2014 and 2013 (in thousands):
 
 
December 31, 2014
 
December 31, 2013
 
 
Carrying Value
 
Fair Value
 
Difference
 
Carrying Value
 
Fair Value
 
Difference
6.625% senior notes
 
$
300,000

 
$
284,250

 
$
(15,750
)
 
$
300,000

 
$
316,700

 
$
16,700

4.75% senior notes
 
250,000

 
214,375

 
(35,625
)
 
250,000

 
234,700

 
(15,300
)
Total
 
$
550,000

 
$
498,625

 
$
(51,375
)
 
$
550,000

 
$
551,400

 
$
1,400