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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure
(In thousands)
Balance at
Beginning
of Period
 
Provision for (Recovery of) Bad Debt
 
Deductions/ Write-Offs and Other Charges, Net
 
Balance at
End of Period
Year Ended December 31, 2017
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
6,064

 
$
3,567

 
$
60

 
$
9,691

Year Ended December 31, 2016
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
4,307

 
$
1,924

 
$
(167
)
 
$
6,064

Year Ended December 31, 2015
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
4,276

 
$
1,705

 
$
(1,674
)
 
$
4,307