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Vessels in Operation (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Vessels in Operation, Less Accumulated Depreciation

 

 

Vessel Cost,

as adjusted for

 

 

 

Accumulated

 

 

 

Net Book

  impairment charges   Depreciation   Value
As of January 1, 2017 $ 916,809   $ (209,481)   $ 707,328
                 
Additions   310         310
Depreciation       (33,494)     (33,494)
Impairment loss   (182,585)     94,961     (87,624)
                 
As of December 31, 2017 $ 734,534   $ (148,014)   $ 586,520
                 
Additions   11,675      —     11,675
Acquisitions through the Poseidon Transaction   617,522      —     617,522
Depreciation       (31,117)     (31,117)
Impairment loss     (139,354)   67,520     (71,834)
                 
As of December 31, 2018 $ 1,224,377   $ (111,611)   $ 1,112,766