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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014:  

(In thousands)

 

2016

 

 

2015

 

 

2014

 

Balance at January 1

 

$

8,046

 

 

$

10,011

 

 

$

5,945

 

Provision charged to income

 

 

1,917

 

 

 

1,106

 

 

 

4,625

 

Accounts written off, net of recoveries

 

 

(208)

 

 

 

(3,071

)

 

 

(559

)

Balance at December 31

 

$

9,755

 

 

$

8,046

 

 

$

10,011