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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure
The following table summarizes our future minimum purchase commitments as of December 31, 2017:

 
Total
 
Less Than 1 Year
 
1-3 Years
 
3-5 Years
 
More Than 5 Years
(dollars in thousands)
 
 
 
 
 
 
 
 
 
Finished goods minimum purchase obligations
$
15,863

 
$
13,596

 
$
2,267

 
$
—

 
$
—

Raw material purchase obligations
456,909

 
333,789

 
123,120

 
—

 
—

Total contractual obligations
$
472,772

 
$
347,385

 
$
125,387

 
$
—

 
$
—