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Interest Expense | 12 Months Ended
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Dec. 31, 2014
Interest and Debt Expense [Abstract] |
Interest Expense | Interest Expense The following table presents an analysis of interest expense:
| For the year Ended December 31,
2012 |  | 2013 |  | 2014
| (Dollars in thousands)
Interest incurred on debt | $ | 10,172 |  |  | $ | 21,589 |  |  | $ | 21,373 |
Amortization of discount on Senior Subordinated Notes | 10,742 |  |  | 11,493 |  |  | 12,298 |
Amortization of debt issuance costs | 1,712 |  |  | 2,504 |  |  | 3,339 |
Supply Chain Financing mark-up | 621 |  |  | 451 |  |  | 47 |
Total interest expense | $ | 23,247 |  |  | $ | 36,037 |  |  | $ | 37,057 |
Interest rates The Revolving Facility had an effective interest rate of 2.42% and 2.17% as of December 31, 2013 and 2014, respectively. The Senior Notes carry an interest rate of 6.375%. The Senior Subordinated Notes have an implied rate of 7.00%.

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 - 9 -Article 9 + Details
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