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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT |
5. | PROPERTY AND EQUIPMENT
​ Property and equipment at December 31, 2020 and 2019, and depreciation expense for the years ended December 31, 2020, 2019 and 2018 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2020 |  | ​ | As of December 31, 2019 |
​ |  | ​ | ​ |  | Accumulated |  | ​ |  |  | ​ | ​ |  | Accumulated |  | ​ |
(In millions) | ​ | Cost | ​ | Depreciation | ​ | Net Book Value |  | ​ | Cost | ​ | Depreciation | ​ | Net Book Value |
Vessels | ​ | $ | 2,191.6 | ​ | $ | 785.5 | ​ | $ | 1,406.1 | ​ | ​ | $ | 1,653.5 | ​ | $ | 818.5 | ​ | $ | 835.0 | ​
Containers and equipment | ​ |  | 572.3 | ​ | ​ | 391.8 | ​ |  | 180.5 | ​ | ​ |  | 544.5 | ​ |  | 378.8 | ​ |  | 165.7 | ​
Terminal facilities and other property | ​ |  | 119.8 | ​ | ​ | 45.1 | ​ |  | 74.7 | ​ | ​ |  | 114.4 | ​ |  | 41.3 | ​ |  | 73.1 | ​
Vessel construction in progress | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | ​ | 488.9 | ​ | ​ | — | ​ | ​ | 488.9 | ​
Other construction in progress | ​ |  | 28.6 | ​ | ​ | — | ​ |  | 28.6 | ​ | ​ |  | 35.4 | ​ |  | — | ​ |  | 35.4 | ​
Total | ​ | $ | 2,912.3 | ​ | $ | 1,222.4 | ​ | $ | 1,689.9 | ​ | ​ | $ | 2,836.7 | ​ | $ | 1,238.6 | ​ | $ | 1,598.1 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
(In millions) |  | 2020 |  | 2019 |  | 2018 |
Depreciation expense | ​ | $ | 97.1 | ​ | $ | 86.3 | ​ | $ | 80.5 | ​
​

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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