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Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts and Reserves
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Years ended December 31, 2017, 2016 and 2015
(in thousands)

Description
2017
 
2016
 
2015
Allowance for doubtful accounts:
 
 
 
 
 
Balance, beginning of period
$
200

 
200

 
150

Charged to expense
399

 
504

 
392

Accounts written off
(675
)
 
(681
)
 
(528
)
Recoveries of accounts written off
266

 
177

 
186

Balance, end of period
$
190

 
200

 
200

Reserve for litigation and claims:
 
 
 
 
 
Balance, beginning of period
$
2,105

 
263

 
133

Charged to expense
528

 
2,186

 
213

Revision to accrual, due to settlements
(245
)
 
(19
)
 
(16
)
Payments
(496
)
 
(325
)
 
(67
)
Balance, end of period
$
1,892

 
2,105

 
263