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Advances - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Advances On Behalf of Borrowers [Line Items]    
Advances, net $ 444,298 $ 893,914
Ginnie Mae Early Buy Out [Member]    
Advances On Behalf of Borrowers [Line Items]    
Advances, net $ 86,400