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CAPITAL LEASE OBLIGATION, Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2015 vessel | Dec. 31, 2018 | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 27, 2018 vessel | Sep. 30, 2018 containership | May 31, 2018 containership
Other Long-term Liabilities [Line Items] |  |  |  |  |  |  |  |
Number of container vessels contracted to be chartered in | vessel | 2 |  |  |  |  | 2 |  |
Term of lease or charter | 15 years |  | 7 years |  | 15 years |  |  |
Capital Leased Assets, Number of Units |  |  |  |  |  |  |  | 4
Interest incurred on capital leases | $ |  |  | $ 31.5 | $ 8.6 | $ 21.8 |  |  |
Number of year before option to buy vessel is available |  | 6 |  |  | 6 |  |  |
10,600 TEU Containership [Member] |  |  |  |  |  |  |  |
Other Long-term Liabilities [Line Items] |  |  |  |  |  |  |  |
Capital Leased Assets, Number of Units |  |  |  |  |  |  | 3 |
Minimum [Member] |  |  |  |  |  |  |  |
Other Long-term Liabilities [Line Items] |  |  |  |  |  |  |  |
Term of lease or charter |  | 6 years | 5 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Other Long-term Liabilities [Line Items] |  |  |  |  |  |  |  |
Term of lease or charter |  | 11 years |  |  |  |  |  |

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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