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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016:  

(In thousands)

 

2018

 

 

2017

 

 

2016

 

Balance at January 1

 

$

10,116

 

 

$

9,755

 

 

$

8,046

 

Provision charged to income

 

 

764

 

 

 

45

 

 

 

1,917

 

Accounts written off, net of recoveries

 

 

(1,226

)

 

 

316

 

 

 

(208

)

Balance at December 31

 

$

9,654

 

 

$

10,116

 

 

$

9,755