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Long-Term Debt and Financing Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Outstanding Debt |
| Period Ended |
| September 30, |  |  | 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% |  | 12,208 |  |  |  | 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 4.06% |  | 146,929 |  |  |  | 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% |  | 25,809 |  |  |  | 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% |  | 61,901 |  |  |  | 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% |  | 37,905 |  |  |  | 50,737 |
Secured Equipment Notes due on various dates in 2019 with monthly principal and interest payments between $1,594 and $325,050 commencing on various dates from 2013 to 2015; interest is paid monthly at a fixed annual rate between 1.87% and 2.62% |  | 18,790 |  |  |  | 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 |
|  | 303,542 |  |  |  | 292,074 |
Less current portion |  | (95,946 | ) |  |  | (77,266 | )
Total long-term debt | $ | 207,596 |  |  | $ | 214,808 |

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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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