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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Allowance for Doubtful Accounts ALLOWANCE FOR DOUBTFUL ACCOUNTS
Activity in the allowance for doubtful accounts was as follows:
 
 
Years ended December 31,
 
 
2018
 
2017
 
2016
Balance, beginning of year
 
$
1,957

 
$
1,829

 
$
1,417

Provision (net of recovery)
 
907

 
370

 
898

Amounts written off, net of recoveries
 
(1,116
)
 
(242
)
 
(486
)
Balance, end of year
 
$
1,748

 
$
1,957

 
$
1,829