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Securitizations and Variable Interests Entities (Tables)
 12 Months Ended
Dec. 31, 2018
Transfers and Servicing [Abstract]  
Summary of Cash Flows Received from and Paid to Securitization Trusts Related to Transfers Accounted for as Sales Outstanding
The following table presents a summary of cash flows received from and paid to securitization trusts related to transfers of loans accounted for as sales that were outstanding:
 
Years Ended December 31,
 
2018
 
2017
 
2016
Proceeds received from securitizations
$
1,290,682

 
$
3,256,625

 
$
5,197,071

Servicing fees collected
45,046

 
41,509

 
14,616

Purchases of previously transferred assets, net of claims reimbursed
(4,395
)
 
(5,948
)
 
(1,271
)
 
$
1,331,333

 
$
3,292,186

 
$
5,210,416
Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans
The following table presents the carrying amounts of our assets that relate to our continuing involvement with forward loans that we have transferred with servicing rights retained as well as our maximum exposure to loss including the UPB of the transferred loans.
 
December 31,
 
2018
 
2017
Carrying value of assets
 
 
 
MSRs ($132,774 and $227 carried at fair value)
$
132,774

 
$
98,059

Advances and match funded advances
138,679

 
57,636

UPB of loans transferred
15,600,971

 
12,077,635

Maximum exposure to loss
$
15,872,424

 
$
12,233,330