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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Schedule II - Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II
Valuation and Qualifying Accounts (in thousands); Years Ended December 31, 2017, 2016, and 2015
Valuation Accounts Deducted in the Balance Sheet From the Assets to Which They Apply
 
Balance
at Beginning
of Period
  
Additions
Charged to
Costs and
Expenses
  
Additions
Recorded
During
Acquisitions
  
Deductions
(A)
  
Balance at
End of
Period
 
                
2015
Allowance for losses:
Trade accounts receivable
 
$
3,838
  
$
1,459
  
$
0
  
$
1,426
  
$
3,871
 
                     
2016
Allowance for losses:
Trade accounts receivable
 
$
3,871
  
$
1,747
  
$
0
  
$
782
  
$
4,836
 
                     
2017
Allowance for losses:
Trade accounts receivable
 
$
4,836
  
$
1,276
  
$
0
  
$
112
  
$
6,000
 
(A) Accounts written off, net of recoveries.