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Schedule II - Valuation And Qualifying Accounts And Reserves Valuation and Qualifying Accounts and Reserves (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance [Table Text Block]
Allowance for Doubtful Accounts:
Description
Balance at
Beginning
of Period
 
Additions
Charged to
Costs &
Expenses
 
Deductions
& Net
Write-Offs
 
Balance at
End of
Period
 
(In thousands)
Year ended December 31, 2017
$
3,773

 
$
348

 
$
(1,671
)
 
$
2,450

Year ended December 31, 2016
$
5,199

 
$
785

 
$
(2,211
)
 
$
3,773

Year ended December 31, 2015
$
5,039

 
$
1,191

 
$
(1,031
)
 
$
5,199