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Other Commitments and Contingencies Other Commitments and Contingencies - Pledged Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Book value of vessels secured against long-term loans | $ 3,165,857 | $ 3,244,291

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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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