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Severance and Other Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Summary of Severance and Other Charges
Our severance and other charges are summarized below (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Severance and other costs
$
2,697

 
$
16,525

 
$
35,484

Fixed asset retirements and abandonments
6,454

 
29,881

 
—

Inventory impairment
51,181

 
—

 
—

Accounts receivable write-offs
15,022

 
—

 
—

 
$
75,354

 
$
46,406

 
$
35,484