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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - Residential Mortgage [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Match Funded Advances [Roll Forward]          
Beginning balance $ 2,409,442 $ 2,552,383 $ 2,552,383 $ 3,049,244 $ 3,629,911
Acquisitions 0 85,521 85,521 [1] 3,589,773 [1] 4,068,959 [1]
Transfers from advances 0 10,156 10,156 [2] 142,286 [2] 74,317 [2]
Sales of advances to HLSS (96,408) 0 0 (3,639,205) (3,240,601)
Collections of pledged advances, net of new advances and other (357,416) (288,481) (238,618) (589,715) (1,483,342)
Ending balance $ 1,955,618 $ 2,359,579 $ 2,409,442 $ 2,552,383 $ 3,049,244
[1] Servicing advances acquired through business acquisitions and asset acquisitions, primarily in connection with the acquisition of MSRs, that were pledged to advance facilities at the date of acquisition.
[2] New servicing advances initially classified as Advances at the date of payment and subsequently pledged to advance facilities.