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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                            
Revenue $ 404,946 [1] $ 493,292 $ 513,698 [1] $ 553,074 $ 551,261 $ 555,955 $ 531,240 $ 544,812 $ 406,266 $ 1,378,641 [1] $ 1,618,033 [1] $ 2,111,325 $ 2,038,273 $ 845,203
Depreciation expense 5,046   5,756             13,467 16,601 21,910 24,245 5,720
Amortization of mortgage servicing rights 18,108   60,783             88,188 186,075 250,375 282,781 72,897
Amortization of debt discount 329   331             1,022 991 1,318 1,412 3,259
Amortization of debt issuance costs 3,325   1,458             10,385 3,754 5,139 4,395 3,718
Loss before income taxes (55,918) $ (519,773) (72,266) $ 77,177 $ 71,703 $ 153,584 $ 69,445 $ 74,158 $ 55,292 (589) 76,614 (443,159) 352,479 257,508
Servicing [Member]                            
Segment Reporting Information [Line Items]                            
Revenue 374,936 [1]   485,303 [1]             1,269,269 [1] 1,526,606 [1] 1,985,436 [2] 1,895,921 [2] 840,630 [2]
Depreciation expense 694   2,636             1,736 8,099 9,955 13,525 1,469
Amortization of mortgage servicing rights 18,023   60,689             87,926 185,263 249,471 282,526 72,897
Amortization of debt discount 329   331             1,022 991 1,318 1,412 3,259
Amortization of debt issuance costs 2,981   1,114             9,336 3,241 4,294 4,395 3,718
Loss before income taxes (12,742)   44,518             78,558 212,669 (174,090) 391,667 274,363
Lending [Member]                            
Segment Reporting Information [Line Items]                            
Revenue 29,662 [1]   26,877 [1]             106,721 [1] 86,811 [1] 119,220 [2] 120,899 [2] 356 [2]
Depreciation expense 96   98             292 235 332 320 8
Amortization of mortgage servicing rights 85   94             262 613 705 255 0
Amortization of debt discount 0   0             0 0 0 0 0
Amortization of debt issuance costs 0   0             0 0 0 0 0
Loss before income taxes 8,588   6,608             39,017 14,242 (26,842) 35,624 (258)
Corporate Items and Other [Member]                            
Segment Reporting Information [Line Items]                            
Revenue 348 [1]   1,557 [1]             2,709 [1] 4,734 [1] 6,825 [2] 22,092 [2] 5,122 [2]
Depreciation expense 4,256   3,022             11,439 8,267 11,623 10,400 4,243
Amortization of mortgage servicing rights 0   0             0 199 199 0 0
Amortization of debt discount 0   0             0 0 0 0 0
Amortization of debt issuance costs 344   344             1,049 513 845 0 0
Loss before income taxes $ (51,764)   $ (123,392)             $ (118,164) $ (150,297) $ (242,227) $ (74,812) $ (16,597)
[1] Intersegment billings for services rendered to other segments are recorded as revenues, as contra-expense or as other income, depending on the type of service that is rendered.
[2] Intersegment billings for services rendered to other segments are recorded as revenues, as contra-expense or as other income, depending on the type of service that is rendered.