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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015:  

 

(In thousands)

 

2017

 

 

2016

 

 

2015

 

Balance at January 1

 

$

9,755

 

 

$

8,046

 

 

$

10,011

 

Provision charged to income

 

 

45

 

 

 

1,917

 

 

 

1,106

 

Accounts written off, net of recoveries

 

 

316

 

 

 

(208

)

 

 

(3,071

)

Balance at December 31

 

$

10,116

 

 

$

9,755

 

 

$

8,046