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Accounts and Notes Receivable (Tables)
3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
The Company’s accounts and notes receivable balances consisted of the following as of March 31, 2018 and December 31, 2017:

 
March 31, 2018
 
December 31, 2017
 
(in thousands)
Short-term
 
 
 
Accounts and notes receivable
$
383,919

 
$
390,705

Allowance for doubtful accounts
(48,905
)
 
(11,985
)
 
$
335,014

 
$
378,720

Long-term
 
 
 
Notes receivable
$
38,814

 
$
15,476

Total accounts and notes receivable
$
373,828

 
$
394,196