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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2019
Valuation Allowance [Abstract]  
Allowance for Doubtful Accounts Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts is summarized as follows for the years presented (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Balance, beginning of year
$
810

 
$
1,272

 
$
1,277

Charges to expense
428

 
393

 
919

Uncollected balances written off, net of recoveries
(774
)
 
(855
)
 
(924
)
Balance, end of year
$
464

 
$
810

 
$
1,272