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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Valuation Allowance [Abstract]  
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,
 
2018
 
2017
 
2016
Balance, beginning of year
$
1,272

 
$
1,277

 
$
749

Charges to expense
393

 
919

 
1,251

Uncollected balances written off, net of recoveries
(855
)
 
(924
)
 
(723
)
Balance, end of year
$
810

 
$
1,272

 
$
1,277