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Related-Party Arrangements (Tables) | 6 Months Ended
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Jun. 30, 2018
Schedule of Related Party Debt | Related party debt consist of the following (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
Principal amount |  | $ | 71,506 |  |  | $ | 79,666 |
Unamortized premium |  |  | 758 |  |  |  | — |
Unaccreted debt issuance costs |  |  | (68 | ) |  |  | — |
Net carrying amount |  | $ | 72,196 |  |  | $ | 79,666 |
Schedule of Interest Expense on Note Payable to Related Party | Interest expense (excluding the amortization of debt premium and debt issuance costs) for the three and six months ended June 30, 2018 and 2017 are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest expense on note payable to related party |  | $ | 1,040 |  |  | $ | 721 |  |  | $ | 2,160 |  |  | $ | 1,435 |
Schedule of Amortization of Premium and Accretion of Debt Issuance Costs | Amortization of the premium and accretion of debt issuance costs related to the 2021 and 2018 notes for the three and six months ended June 30, 2018 and 2017 are as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Amortization of debt premium |  | $ | 40 |  |  | $ | 61 |  |  | $ | 83 |  |  | $ | 120 |
Accretion expense - debt issuance cost |  |  | 1 |  |  | $ | 68 |  |  | $ | 1 |  |  | $ | 134 |
Related Party Notes |
Schedule of Amortization of Premium and Accretion of Debt Issuance Costs | Amortization of the premium and accretion of debt issuance costs related to the related party notes for the three and six months ended June 30, 2018 and 2017 are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Amortization of debt premium |  | $ | 57 |  |  | $ | 61 |  |  | $ | 67 |  |  | $ | 120 |
Accretion expense - debt issuance cost |  | $ | 6 |  |  | $ | 6 |  |  | $ | 8 |  |  | $ | 8 |

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- Definition Schedule of amortization of debt issuance cost and debt discount. + References No definition available. + Details
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- Definition Schedule of related party debt. + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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