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Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)
 3 Months Ended
Mar. 31, 2021
Schedule Of Investments [Abstract]  
Equity Method Investments Investments, at equity, and advances to 50% or less owned companies as of March 31, 2021 and December 31, 2020 were as follows (in thousands):

 

 

Ownership

 

 

2021

 

 

2020

 

MexMar

 

 

49.0

%

 

$

53,778

 

 

$

50,037

 

OSV Partners(1)

 

 

30.4

%

 

 

8,493

 

 

 

9,094

 

SEACOR Marlin

 

 

49.0

%

 

 

8,581

 

 

 

7,979

 

MEXMAR Offshore(2)

 

 

49.0

%

 

 

2,696

 

 

 

1,960

 

Offshore Vessel Holdings

 

 

49.0

%

 

 

1,750

 

 

 

2,388

 

Other

 

20.0% - 50.0

%

 

 

3,702

 

 

 

3,850

 

 

 

 

 

 

 

$

79,000

 

 

$

75,308

 

(1)The Company owns 66.7% of the General Partner and 29.7% of the limited partnership interest of OSV Partners.

(2)This Joint Venture holds the investment in UP Offshore.