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Vessels, net: | 12 Months Ended
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Dec. 31, 2019
Vessels, Net [Abstract] |
Vessels, net: | 4. Vessels, net: The amounts in the accompanying consolidated condensed balance sheets are analyzed as follows:
|  | Vessel Cost |  |  | Accumulated Depreciation |  | Net Book Value
Balance December 31, 2017 |  | $ | 1,167,500 |  |  | $ | (190,202) |  |  | $ | 977,298
Other additions to vessels’ cost |  |  | 409 |  |  |  | — |  |  |  | 409
Depreciation |  |  | — |  |  |  | (30,330) |  |  |  | (30,330)
Balance December 31, 2018 |  | $ | 1,167,909 |  |  | $ | (220,532) |  |  | $ | 947,377
Depreciation |  |  | — |  |  |  | (30,680) |  |  |  | (30,680)
Balance December 31, 2019 |  | $ | 1,167,909 |  |  | $ | (251,212) |  |  | $ | 916,697
As of December 31, 2019, all vessels comprising the Partnership’s fleet were first priority mortgaged as collateral to secure the $675 Million Credit Facility, further discussed in Note 5.

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- Definition Disclosure of vessels that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + Details
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