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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Allowance for Doubtful Accounts and Other Accounts Receivable Allowance

The following is an analysis of the allowance for doubtful accounts and other accounts receivable allowances for the years ended December 31, 2019, 2018 and 2017:  

(In thousands)

 

2019

 

 

2018

 

 

2017

 

Balance at January 1

 

$

9,654

 

 

$

10,116

 

 

$

9,755

 

Provision charged to income

 

 

29

 

 

 

764

 

 

 

45

 

Accounts written off, net of recoveries

 

 

(358

)

 

 

(1,226

)

 

 

316

 

Balance at December 31

 

$

9,325

 

 

$

9,654

 

 

$

10,116