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ACCOUNTS RECEIVABLE, NET
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
ACCOUNTS RECEIVABLE, NET
ACCOUNTS RECEIVABLE, NET
Accounts receivable, net consists of the following as of December 31:
(in thousands)
 
2018
 
2017
 
 
 
 
 
Billed
 
$
35,590

 
$
40,787

Unbilled
 
11,759

 
22,532

 
 
47,349

 
63,319

Less: Allowance for doubtful accounts
 
(10,883
)
 
(10,579
)
 
 
 
 
 
Total
 
$
36,466

 
$
52,740


Unbilled accounts receivable consist primarily of certain real estate asset management, REO sales, title and closing services for which we generally recognize revenue when the service is provided but collect upon closing of the sale, and foreclosure trustee services, for which we generally recognize revenues over the service delivery period but bill following completion of the service. We also include amounts in unbilled accounts receivable that are earned during a month and billed in the following month.
Bad debt expense amounted to $2.8 million, $5.1 million and $1.8 million for the years ended December 31, 2018, 2017 and 2016, respectively, and is included in selling, general and administrative expenses in the consolidated statements of operations and comprehensive income (loss).