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Finance Charges (Tables) | 12 Months Ended
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Dec. 31, 2017
Finance Costs [Abstract] |
Summary of Finance Charges |
|  | 2017 |  |  | 2016 |
Interest: |  |  |  |  |  |  |  |
Long-term debt |  | $ | 128,381 |  |  | $ | 138,335 |
Other |  |  | 1,083 |  |  |  | 226 |
Income |  |  | (1,858 | ) |  |  | (3,445 | )
Amortization of debt issue costs |  |  | 10,162 |  |  |  | 11,244 |
Other |  |  | 160 |  |  |  | — |
Finance charges |  | $ | 137,928 |  |  | $ | 146,360 |

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