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Long-Term Debt and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Schedule of Outstanding Debt | Our outstanding debt is as follows (in thousands):
| Period Ended |
| December 31, |  |  | December 31, |
| 2016 |  |  | 2015 |
Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $0.01 million and $0.3 million commencing on various dates in 2016 and 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96% | $ | 59,836 |  |  | $ | - |
Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $0.04 million and $0.4 million commencing on various dates in 2015 and 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.26% |  | 48,633 |  |  |  | 61,206 |
Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $0.08 million and $0.4 million commencing on various dates in 2014; interest is paid monthly at a fixed annual rate between 1.87% and 2.24% |  | 49,464 |  |  |  | 67,486 |
Secured Equipment Notes due in June 2018 with quarterly principal and interest payments of $0.5 million commencing in August 2013; interest is paid quarterly at a fixed annual rate between 1.9% and 2.0% |  | 2,759 |  |  |  | 4,612 |
|  | 160,692 |  |  |  | 133,304 |
Less current portion |  | (45,163 | ) |  |  | (32,409 | )
Total long-term debt | $ | 115,529 |  |  | $ | 100,895 |
Summary of Aggregate Principal Payments | Aggregate principal payments, in thousands, due subsequent to December 31, 2016, are as follows:
2017 | $ | 45,163 |
2018 |  | 44,466 |
2019 |  | 38,187 |
2020 |  | 22,677 |
2021 |  | 10,199 |
| $ | 160,692 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + 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 + Details
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