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Interest Expense (Tables)
 9 Months Ended
Sep. 30, 2017
Interest and Debt Expense [Abstract]  
Schedule Of Interest Expense
The following tables present the components of interest expense: 
 
For the Three Months Ended September 30,
 
For the Nine Months
Ended September 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Interest incurred on debt
$
5,306

 
$
6,097

 
$
15,020

 
$
18,183

Accretion of fair value adjustment on
   Senior Notes
1,581

 
1,618

 
4,715

 
4,826

Amortization of debt issuance costs
77

 
77

 
125

 
231

Total interest expense
$
6,964

 
$
7,792

 
$
19,860

 
$
23,240