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Debt - Maturities (Details) $ in Thousands | Dec. 31, 2018 USD ($) instrument
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Aggregate maturities of obligations under capital leases |
January 2019 - December 2019 | $ 2,830
January 2020 - December 2020 | 2,276
January 2021 - December 2021 | 19
Obligations under capital leases | $ 5,125
Notes payable to finance companies for insurance |
Notes payable |
Number of outstanding notes payable | instrument | 2
Aggregate principal amount outstanding | $ 1,680
Interest rate (as a percent) | 3.80%
Notes payable to commercial banks |
Notes payable |
Aggregate principal amount outstanding | $ 5,975
Interest rate (as a percent) | 5.00%
Obligations under capital leases | Minimum |
Notes payable |
Interest rate (as a percent) | 4.65%
Obligations under capital leases | Maximum |
Notes payable |
Interest rate (as a percent) | 4.93%

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