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Debt Warehouse Facilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Warehouse Facilities [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | Warehouse Facilities
| December 31, 2017 |  | December 31, 2016
($ in millions) | Outstanding Balance | Maximum Capacity |  | Outstanding Balance | Maximum Capacity
Warehouse Facilities: |  |  |  |  |
LIBOR plus 1.4%, expires September 24, 2018 (1) | $ | 156.4 |  | 375.0 |  |  | 135.2 |  | 275.0 |
LIBOR plus 1.35%, expires September 29, 2018 (2) | 74.8 |  | 375.0 |  |  | 314.7 |  | 650.0 |
LIBOR plus 1.5%, expires August 31, 2018 (3) | — |  | 100.0 |  |  | 15.0 |  | 100.0 |
Fannie Mae ASAP program, LIBOR plus 1.30% to 1.45% | 79.2 |  | n/a |  |  | 116.1 |  | n/a |
Gross warehouse facilities | 310.4 |  | 850.0 |  |  | 581.0 |  | 1,025.0 |
Debt issuance costs | (1.2 | ) | n/a |  |  | (0.9 | ) | n/a |
Total warehouse facilities | $ | 309.2 |  | 850.0 |  |  | 580.1 |  | 1,025.0 |

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- Definition Warehouse Facilities [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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