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Schedule II Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II Valuation and Qualifying Accounts and Reserves
Schedule II
Valuation and Qualifying Accounts and Reserves

Changes in the Company’s allowance for doubtful accounts for accounts receivable for the years ended December 31, 2017, 2016 and 2015 are summarized below:
Description
 
Balance at Beginning of Year
 
Recoveries added to allowance
 
Bad debt expense
 
Losses charged to allowance
 
Balance at End of Year
(in thousands)
 
Year Ended December 31, 2017
Allowance for doubtful accounts
 
$
759

 
$
616

 
$
2,179

 
$
(3,088
)
 
$
466

 
 
Year Ended December 31, 2016
Allowance for doubtful accounts
 
$
418

 
$
628

 
$
2,456

 
$
(2,743
)
 
$
759

 
 
Year Ended December 31, 2015
Allowance for doubtful accounts
 
$
762

 
$
602

 
$
1,640

 
$
(2,586
)
 
$
418