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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Notes and Loan Payable
Notes and loan payable includes the following:
 
 
 
 
 
December 31,
 
2017
 
2016
 
(Dollars in thousands)
Senior notes due 2027
 
 
 
Principal
$
500,000

 
$
—

Unamortized debt issue costs
(5,572
)
 
—

Unamortized discount
(335
)
 
—

Senior notes due 2021
 
 
 
Principal
—

 
400,000

Unamortized debt issue costs
—

 
(5,733
)
Term loan due 2019
 
 
 
Principal
—

 
100,000

Unamortized debt issue costs
—

 
(512
)
 
$
494,093

 
$
493,755