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Debt Warehouse Facilities (Tables)
12 Months Ended
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