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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
(amounts in thousands)
 

Description
 
Balance At
Beginning
of Year
 
Additions
Charged
Against
Operations
 
Uncollectible
Accounts
Written-Off
 
Balance
at End of
Year
Year ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
3,723

 
$
(1,650
)
 
$
(466
)
 
$
1,607

Year ended December 31, 2016
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
3,037

 
$
908

 
$
(222
)
 
$
3,723

Year ended December 31, 2015
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
1,847

 
$
1,298

 
$
(108
)
 
$
3,037