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Long-term debt - Terms and Covenants (Details) | 12 Months Ended
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Dec. 31, 2019
Line of Credit Facility [Line Items] |
Line of Credit Facility, Covenant Terms | The Company's outstanding credit facilities and senior notes generally contain customary affirmative and negative covenants, on a subsidiary level, including limitations to: - pay dividends if there is an event of default under the Company's credit facilities; - incur additional indebtedness, including the issuance of guarantees, refinance or prepay any indebtedness, unless certain conditions exist; - create liens on Company's assets, unless otherwise permitted under Company's credit facilities; - change the flag, class or management of Company's vessels or terminate or materially amend the management agreement relating to each vessel; - acquire new or sell vessels, unless certain conditions exist; - merge or consolidate with, or transfer all or substantially all Company's assets to, another person; or - enter into a new line of business. Furthermore, the Company's credit facilities and senior notes contain financial covenants requiring the Company to maintain various financial ratios, including: - a minimum percentage of aggregate vessel value to secured loans (security cover ratio or ''SCR''); - a maximum ratio of total liabilities to market value adjusted total assets; - a minimum EBITDA to interest coverage ratio; - a minimum liquidity; and - a minimum market value adjusted net worth. As of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, not legally restricted, of $53,500 and $58,000, respectively, which is included within ''Cash and cash equivalents'' in the balance sheets. In addition, as of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, legally restricted, of $8,956 and $8,443, respectively, which is included within ''Restricted cash'' current and non-current, in the consolidated balance sheets.
Debt Instrument, Covenant Compliance | As of December 31, 2019, the Company was in compliance with the applicable financial and other covenants contained in its debt agreements, including the 2022 Notes.

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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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