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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II Valuation and Qualifying Accounts
Schedule II
Valuation and Qualifying Accounts
For the Years Ended December 31, 2019, 2018 and 2017
(in thousands)

 
 
Balance at
beginning
of year
 
Charged to
costs and
expenses
 
Deductions
 
Balance at
end of year
Year ended December 31, 2019
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
7,976

 
—

 
(7,976
)
 
$
—

Tax valuation allowance
 
$
10,578

 
4

 
—

 
$
10,582

 
 
 
 
 
 
 
 
 
Year ended December 31, 2018
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
6,567

 
3,155

 
(1,746
)
 
$
7,976

Tax valuation allowance
 
$
12,347

 
(1,769
)
 
—

 
$
10,578

 
 
 
 
 
 
 
 
 
Year ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
6,886

 
2,143

 
(2,462
)
 
$
6,567

Tax valuation allowance
 
$
21,175

 
(8,828
)
 
—

 
$
12,347