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Interest Expense | 12 Months Ended
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Dec. 31, 2018
Interest and Debt Expense [Abstract] |
Interest Expense | Interest Expense The following table presents an analysis of interest expense:
| For the Year Ended December 31
| 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Interest incurred on debt | $ | 100,844 |  |  | $ | 24,060 |  |  | $ | 20,408 |
Related Party Promissory Note interest expense | 5,090 |  |  | — |  |  | — |
Senior Note redemption premium | 4,782 |  |  | — |  |  | — |
Accretion of fair value adjustment on Senior Notes | 19,414 |  |  | 6,454 |  |  | 6,305 |
Accretion of original issue discount on 2018 Term Loans | 1,455 |  |  | — |  |  | — |
Amortization of debt issuance costs | 3,476 |  |  | 309 |  |  | 201 |
Total interest expense | $ | 135,061 |  |  | $ | 30,823 |  |  | $ | 26,914 |
Interest rates The 2018 Credit Agreement had an effective interest rate of 6.02% as of December 31, 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 7 "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 in 2018, included accelerated accretion of $18.7 million 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-12) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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