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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Advances [Roll Forward]    
Beginning balance $ 249,382 $ 211,793
Asset acquisitions 688 0
Sales of advances (707) (877)
Collections of advances, charge-offs and other, net (15,802) (37,109)
Net increase in allowance for losses (4,394) (20)
Ending balance $ 229,167 $ 173,787