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VESSELS UNDER CAPITAL LEASE, NET (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2015 | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) containership | Dec. 31, 2018 USD ($) | Sep. 30, 2018 containership | May 31, 2018 containership | Apr. 05, 2018 containership
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross |  | $ 754,392 | $ 755,058 | $ 754,392 |  |  |
Number of Container Vessels acquired | containership |  |  | 7 |  | 3 | 4 | 15
Term of lease or charter | 15 years |  | 7 years | 15 years |  |  |
Number of year before option to buy vessel is available |  | 6 |  | 6 |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  | $ 4,503 | $ 22,509 | $ 4,503 |  |  |
Capital Leases, Balance Sheet, Assets by Major Class, Net |  | $ 749,889 | $ 732,549 | $ 749,889 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Term of lease or charter |  | 6 years | 5 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Term of lease or charter |  | 11 years |  |  |  |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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