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Interest Expense (Tables)
 6 Months Ended
Jun. 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 June 30,
 
For the Six Months
Ended June 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Interest incurred on debt
$
4,819

 
$
6,217

 
$
9,716

 
$
12,086

Accretion of fair value adjustment on
   Senior Notes
1,571

 
1,609

 
3,134

 
3,208

Amortization of debt issuance costs
46

 
76

 
46

 
154

Total interest expense
$
6,436

 
$
7,902

 
$
12,896

 
$
15,448