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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Allowance for Doubtful Accounts
 
Balance at
Beginning
 
Charged to
 
Charged to
Other
 
 
 
Balance at
 
of Period
 
Expense
 
Accounts(1)
 
Deductions(2)
 
End of Period
Allowance for doubtful accounts
(In thousands)
Year ended December 31, 2018
$
21,313

 
10,854

 
—

 
(7,699
)
 
$
24,468

Year ended December 31, 2017
22,007

 
8,466

 
—

 
(9,160
)
 
21,313

Year ended December 31, 2016
22,587

 
5,888

 
21

 
(6,489
)
 
22,007

_________________________
(1) 
Represents allowance for doubtful accounts in connection with certain acquisitions and divestitures.
(2) 
Includes a reduction in the allowance for doubtful accounts due to write-off of accounts receivable.