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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 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 (132,859) 0
Collections of advances, net of new advances, and other (188,113) (34,185)
Ending balance $ 572,942 $ 945,809