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Debt (Tables)
12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Debt [Table Text Block]
Long-term debt consisted of the following:
 
 
 
December 31,
2014
 
December 31,
2013
 
 
(thousands)
Asset-based revolving credit facility
 
$

 
$

6.375% senior notes
 
299,990

 
299,990

Unamortized premium on 6.375% senior notes
 
1,425

 
1,623

Long-term debt
 
$
301,415

 
$
301,613