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Summary of Significant Accounting Policies - Leases (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 USD ($) lease vessel
Property, Plant and Equipment [Line Items] |  |
Number of vessels chartered to customers | vessel |  | 12
Lease payments | $ |  | $ 2,404
Time charter, term to completion | 15 years | 30 days
Number of noncancelable office leases | lease |  | 2
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Vessel lease term |  | 20 days
Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Vessel lease term |  | 83 days

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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