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Interest Expense | 3 Months Ended
--- | ---
Mar. 31, 2015
Interest and Debt Expense [Abstract] |
Interest Expense | Interest Expense The following table presents an analysis of interest expense:
| For the Three Months Ended
| March 31,
| 2014 |  | 2015
| (Dollars in thousands)
Interest incurred on debt | $ | 5,322 |  |  | $ | 5,171 |
Amortization of discount on Senior Subordinated Notes | 2,997 |  |  | 3,207 |
Amortization of debt issuance costs | 633 |  |  | 543 |
Supply Chain Financing mark-up | 47 |  |  | — |
Total interest expense | $ | 8,999 |  |  | $ | 8,921 |
Interest Rates The Revolving Facility had an effective interest rate of 2.17% and 2.44% as of December 31, 2014 and March 31, 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%.

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- Definition The entire disclosure for interest income and interest expense for enterprises that derive a significant portion of their revenue from interest collected on investments, loans, and securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-12) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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