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Notes Payable and Amounts Due Under Repurchase Agreements (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Notes Payable
Notes payable includes the following:
 
June 30, 2018
 
December 31, 2017
 
(Dollars in thousands)
Senior notes due 2027
 
 
 
Principal
$
500,000

 
$
500,000

Unamortized debt issue costs
(5,340
)
 
(5,572
)
Unamortized discount
(321
)
 
(335
)
 
$
494,339

 
$
494,093