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Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts and Reserves
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Years ended December 31, 2018, 2017 and 2016
(in thousands)

Description
2018
 
2017
 
2016
Allowance for doubtful accounts:
 
 
 
 
 
Balance, beginning of period
$
190

 
200

 
200

Charged to expense
430

 
399

 
504

Accounts written off
(650
)
 
(675
)
 
(681
)
Recoveries of accounts written off
302

 
266

 
177

Balance, end of period
$
272

 
190

 
200

Reserve for litigation and claims:
 
 
 
 
 
Balance, beginning of period
$
1,892

 
2,105

 
263

Charged to expense
480

 
528

 
2,186

Revision to accrual, due to settlements
1

 
(245
)
 
(19
)
Payments
(192
)
 
(496
)
 
(325
)
Balance, end of period
$
2,181

 
1,892

 
2,105