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Interest expense | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Interest and Debt Expense [Abstract] |  |
Interest Expense | (8) Interest expense The following tables present the components of interest expense:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | For the six months ended June 30, |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | 2018 |  | 2017 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |
Interest incurred on debt |  | $ | 35,473 |  | $ | 12,086 |
Related party Promissory Note interest expense |  |  | 5,090 |  |  | — |
Senior Note redemption premium |  |  | 4,782 |  |  | — |
Accretion of fair value adjustment on Senior Notes |  |  | 19,414 |  |  | 3,208 |
Accretion of original issue discount on 2018 Term Loans |  |  | 357 |  |  | — |
Amortization of debt issuance costs |  |  | 1,416 |  |  | 154 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total interest expense |  | $ | 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. | (8) Interest expense The following table presents an analysis of interest expense:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Successor |  | Predecessor |
|  | For the year ended December 31, 2017 |  | For the year ended December 31, 2016 |  | For the period August 15 through December 31, 2015 |  | For the period January 1 through August 14, 2015 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Interest incurred on debt |  | $ | 24,060 |  | $ | 20,408 |  | $ | 7,694 |  | $ | 12,066 |
Amortization of discount on Senior Subordinated Notes |  | — |  | — |  | — |  | 12,027 |
Accretion of fair value adjustment on Senior Notes |  | 6,454 |  | 6,305 |  | 2,305 |  | — |
Amortization of debt issuance costs |  | 309 |  | 201 |  | — |  | 2,118 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total interest expense |  | $ | 30,823 |  | $ | 26,914 |  | $ | 9,999 |  | $ | 26,211 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest rates The revolving facility had an effective interest rate of 4.57% and 5.52% as of December 31, 2017 and 2016, respectively. The Senior Notes carried an interest rate of 6.375%. The Senior Subordinated Notes had an implied rate of 7.00%. On August 11, 2015, we prepaid our Senior Subordinated Notes (see Note 7 "Debt and liquidity"). This prepayment resulted in accelerated amortization of $4.5 million as the Senior Subordinated Notes were prepaid at the face value. The accelerated expense was recorded in the predecessor period.

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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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