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Long-Term Debt and Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Outstanding Debt | Our outstanding debt is as follows (in thousands):
| December 31, |  |  | December 31, |
| 2018 |  |  | 2017 |
| (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; interest is paid monthly at a fixed annual rate between 2.85% and 3.41% |  | 11,658 |  |  |  | 13,586 |
Secured Equipment Notes due on various dates in 2023 with monthly principal and interest payments between $669 and $341,341 commencing on various dates in 2016, 2017 and 2018; interest is paid monthly at a fixed annual rate between 2.23% and 4.08% |  | 192,858 |  |  |  | 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% |  | 24,092 |  |  |  | 30,301 |
Secured Equipment Notes due on various dates in 2021 with monthly principal and interest payments between $1,940 and $352,655 commencing on various dates from 2014 to 2017; interest is paid monthly at a fixed annual rate between 2.04% and 2.96% |  | 55,855 |  |  |  | 76,885 |
Secured Equipment Notes due on various dates in 2020 with monthly principal and interest payments between $3,614 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% |  | 32,904 |  |  |  | 50,737 |
Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $3,243 and $322,780 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62% |  | 13,417 |  |  |  | 36,178 |
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 2013 and 2014; interest is paid monthly at a fixed annual rate between 2.05% and 2.7% |  | - |  |  |  | 2,406 |
|  | 330,784 |  |  |  | 292,074 |
Less current portion |  | (101,713 | ) |  |  | (77,266 | )
Total long-term debt | $ | 229,071 |  |  | $ | 214,808 |
Summary of Aggregate Principal Payments | Aggregate principal payments, in thousands, due subsequent to December 31, 2018, are as follows:
2019 | $ | 101,713 |
2020 |  | 83,589 |
2021 |  | 65,521 |
2022 |  | 49,327 |
2023 |  | 29,507 |
2024 and thereafter |  | 1,127 |
| $ | 330,784 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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