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Interest Expense | 9 Months Ended
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Sep. 30, 2018
Interest and Debt Expense [Abstract] |
Interest Expense | 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Interest incurred on debt | $ | 32,278 |  |  | $ | 6,097 |  |  | $ | 67,751 |  |  | $ | 18,183 |
Related party Promissory Note interest expense | — |  |  | — |  |  | 5,090 |  |  | — |
Senior Note redemption premium | — |  |  | — |  |  | 4,782 |  |  | — |
Accretion of fair value adjustment on Senior Notes | — |  |  | 1,618 |  |  | 19,414 |  |  | 4,826 |
Accretion of original issue discount on 2018 Term Loans | 549 |  |  | — |  |  | 906 |  |  | — |
Amortization of debt issuance costs | 1,028 |  |  | 77 |  |  | 2,444 |  |  | 231 |
Total interest expense | $ | 33,855 |  |  | $ | 7,792 |  |  | $ | 100,387 |  |  | $ | 23,240 |
Interest Rates The 2018 Credit Agreement had an effective interest rate of 5.74% as of September 30, 2018. The Old Revolving Facility and Old Term Loan Facility had an effective interest rate of 4.57% as of December 31, 2017 and the Senior Notes had a fixed interest rate of 6.375%, both of which were repaid on February 12, 2018 as part of our refinancing (see Note 6 "Debt and Liquidity"). As a result of our February 12, 2018 refinancing, we paid a prepayment premium for the redemption of our Senior Notes totaling $4.8 million. The accretion of the August 15, 2015 fair value adjustment to our Senior Notes totaling $19.4 million included accelerated accretion of $18.7 million for the nine months ended September 30, 2018 resulting from the prepayment. Amortization of debt issuance costs included $0.3 million of accelerated amortization related to the refinancing.

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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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