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Interest Expense
 6 Months Ended
Jun. 30, 2015
Interest and Debt Expense [Abstract]  
Interest Expense
Interest Expense
The following table presents an analysis of interest expense: 
 
For the Three Months Ended
 
For the Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2015
 
2014
 
2015
 
(Dollars in thousands)
 
(Dollars in thousands)
 
 
 
 
 
 
 
 
Interest incurred on debt
$
5,345

 
$
5,282

 
$
10,714

 
$
10,452

Amortization of discount on Senior Subordinated Notes
3,048

 
3,261

 
6,045

 
6,468

Amortization of debt issuance costs
762

 
652

 
1,395

 
1,196

Total interest expense
$
9,155

 
$
9,195

 
$
18,154

 
$
18,116


Interest Rates
The Revolving Facility had an effective interest rate of 2.17% and 2.37% as of December 31, 2014 and June 30, 2015, respectively. The Senior Subordinated Notes have an implied interest rate of 7.00%. The Senior Notes have a fixed interest rate of 6.375%.