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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Lower of Cost or Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance $ 29,374 [1] $ 104,992 [1] $ 87,492
Purchases 1,016,791 1,878,561 1,056,172
Proceeds from sales (861,569) (1,699,427) (1,001,939)
Principal collections (10,207) (22,607) (53,400)
Transfers to Receivables, net (171,797) (256,336) (53,468)
Transfers to Other assets (875) (7,675) (18,594)
Transfers to Loans held for sale - Fair value 0 (3,266) (1,200)
Gain on sale of loans 11,683 24,565 43,449
Decrease in valuation allowance 2,746 4,594 35,018
Other 7,950 5,973 11,462
Ending balance [1] $ 24,096 $ 29,374 $ 104,992
[1] At December 31, 2017, 2016 and 2015, the balances include $19.6 million, $24.8 million and $85.9 million, respectively, of loans that we were required to repurchase from Ginnie Mae guaranteed securitizations as part of our servicing obligations. Repurchased loans are modified or otherwise remediated through loss mitigation activities or are reclassified to receivables.