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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Notes and Loan Payable
Notes and loan payable includes the following:
 
June 30, 2017
 
December 31, 2016
 
(Dollars in thousands)
Senior notes due 2021
 
 
 
Principal
$
400,000

 
$
400,000

Unamortized debt issue costs
(5,187
)
 
(5,733
)
Senior notes due 2027
 
 
 
Principal
500,000

 
—

Unamortized debt issue costs
(5,804
)
 
—

Unamortized discount
(349
)
 
—

Term loan due 2019
 
 
 
Principal
—

 
100,000

Unamortized debt issue costs
—

 
(512
)
 
$
888,660

 
$
493,755