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Leases, User Charges and Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Future Payments Due | Future Payments Due:
|  |  |  |  | Operating |  |  |  |  |
|  |  |  |  | Leases and |  |  |  |  |
| Capital |  |  | Other |  |  |  |  |
| Lease |  |  | Commitments |  |  | Total |
2018 | $ | 3,137 |  |  | $ | 10,755 |  |  | $ | 13,892 |
2019 |  | 3,137 |  |  |  | 8,622 |  |  |  | 11,759 |
2020 |  | 3,145 |  |  |  | 7,700 |  |  |  | 10,845 |
2021 |  | 1,821 |  |  |  | 7,272 |  |  |  | 9,093 |
2022 |  | - |  |  |  | 6,576 |  |  |  | 6,576 |
2023 and thereafter |  | - |  |  |  | 7,494 |  |  |  | 7,494 |
| $ | 11,240 |  |  | $ | 48,419 |  |  | $ | 59,659 |
Less: Imputed interest |  | (767 | ) |  |  |  |  |  |  |  |
Net capital lease liability | $ | 10,473 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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