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Schedule II - Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts and Reserves
Schedule II
Valuation and Qualifying Accounts and Reserves
(in thousands)
 
Allowance for Accounts Receivable
 
Balance at
Beginning
of Year
 
Additions
Charged
Against
Revenue
 
Additions
Charged to
Cost and
Expense
 
Deductions
 
Balance at
End of Year
Year Ended December 31, 2019
$
3,350

 
$
5,895

 
$
1,855

 
$
(7,749
)
 
$
3,351

Year Ended December 31, 2018
$
2,038

 
$
3,039

 
$
3,520

 
$
(5,247
)
 
$
3,350

Year Ended December 31, 2017
$
3,782

 
$
8,886

 
$
—

 
$
(10,630
)
 
$
2,038