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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Advances [Roll Forward]    
Beginning balance $ 893,914 $ 890,832
Acquisitions 0 99,318
Transfers to match funded advances 0 (10,156)
Sales of advances (224,756) 0
Collections of advances, net of new advances, and other (151,780) 7,292
Ending balance $ 517,378 $ 987,286