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Long-Term Debt and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Outstanding Debt | Our outstanding debt is as follows (in thousands):
| December 31, |  |  | December 31, |
| 2017 |  |  | 2016 |
| (in thousands except principal and interest payments) |
Revolving line of credit | $ | 45,000 |  |  | $ | - |
Secured Equipment Notes due on various dates in 2024 with monthly principal and interest payments between $403 and $83,000 commencing on various dates in 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.85% and 3.41% |  | 13,586 |  |  |  | - |
Secured Equipment Notes due on various dates in 2023 with monthly principal and interest payments between $669 and $62,665 commencing on various dates in 2016, 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.23% and 3.28% |  | 36,981 |  |  |  | - |
Secured Equipment Notes due on various dates in 2022 with monthly principal and interest payments between $3,030 and $254,190 commencing on various dates from 2015 to 2017; interest is paid monthly at a fixed annual rate of between 2.16% and 2.87% |  | 30,301 |  |  |  | - |
Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $1,940 and $326,333 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96% |  | 76,885 |  |  |  | 59,836 |
Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $6,175 and $398,496 commencing on various dates from 2013 to 2016; interest is paid monthly at a fixed annual rate between 1.72% and 2.78% |  | 50,737 |  |  |  | 48,633 |
Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $1,594 and $444,000 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62% |  | 36,178 |  |  |  | 49,464 |
Secured Equipment Notes due on various dates in 2018 with monthly principal and interest payments between $6,480 and $163,428 commencing on various dates in 2012, 2013 and 2014; interest is paid monthly at a fixed annual rate between 2.05% and 2.70% |  | 2,406 |  |  |  | 2,759 |
|  | 292,074 |  |  |  | 160,692 |
Less current portion |  | (77,266 | ) |  |  | (45,163 | )
Total long-term debt | $ | 214,808 |  |  | $ | 115,529 |
Summary of Aggregate Principal Payments | Aggregate principal payments, in thousands, due subsequent to December 31, 2017, are as follows:
2018 | $ | 77,266 |
2019 |  | 70,033 |
2020 |  | 50,268 |
2021 |  | 30,704 |
2022 |  | 13,092 |
2023 and thereafter |  | 50,711 |
| $ | 292,074 |

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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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