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Fair Value of Financial Instruments and Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of accounts receivable
Receivables consisted of the following at December 31:
(In thousands)
2019
 
2018
Trade receivables:
 
 
 
Gross trade receivables
$
207,554

 
$
248,176

Allowance for doubtful accounts
(6,007
)
 
(10,034
)
Net trade receivables
201,547

 
238,142

Income tax receivables
7,393

 
9,027

Other receivables
7,774

 
7,225

Total receivables, net
$
216,714

 
$
254,394


Schedule of allowance for doubtful accounts Changes in this allowance were as follows:
(In thousands)
2019
 
2018
 
2017
Balance at beginning of year
$
10,034

 
$
9,457

 
$
8,849

Provision for doubtful accounts
1,792

 
2,849

 
1,481

Write-offs, net of recoveries
(5,819
)
 
(2,272
)
 
(873
)
Balance at end of year
$
6,007

 
$
10,034

 
$
9,457