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Debt - Aggregate principal amount and interest rates (Details) - Notes payable to finance companies for insurance - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
DEBT |  |
Aggregate principal amount outstanding | $ 40 | $ 1,746
Interest rate (as a percent) | 4.99% |
Minimum |  |
DEBT |  |
Interest rate (as a percent) |  | 4.05%
Maximum |  |
DEBT |  |
Interest rate (as a percent) |  | 4.99%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Details
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- Details
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- Details
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