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Interest Expense | 6 Months Ended
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Jun. 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 June 30, |  | For the Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Interest incurred on debt | $ | 22,554 |  |  | $ | 6,217 |  |  | $ | 35,473 |  |  | $ | 12,086 |
Related party Promissory Note interest expense | 5,090 |  |  | — |  |  | 5,090 |  |  | — |
Senior Note redemption premium | — |  |  | — |  |  | 4,782 |  |  | — |
Accretion of fair value adjustment on Senior Notes | — |  |  | 1,609 |  |  | 19,414 |  |  | 3,208 |
Accretion of original issue discount on 2018 Term Loans | 268 |  |  | — |  |  | 357 |  |  | — |
Amortization of debt issuance costs | 755 |  |  | 76 |  |  | 1,416 |  |  | 154 |
Total interest expense | $ | 28,667 |  |  | $ | 7,902 |  |  | $ | 66,532 |  |  | $ | 15,448 |
Interest Rates The 2018 Credit Agreement had an effective interest rate of 5.59% as of June 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 six months ended June 30, 2018 resulting from the prepayment.

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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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