Annual report pursuant to Section 13 and 15(d)

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summarized Financial Information For The Company's Investments, At Equity) (Details)

v3.20.4
Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summarized Financial Information For The Company's Investments, At Equity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trailer Bridge      
Balance Sheet [Abstract]      
Current assets $ 46,951 $ 43,996  
Noncurrent assets 73,098 75,394  
Current liabilities 18,022 16,715  
Noncurrent liabilities 3,058 35  
Income Statement [Abstract]      
Operating Revenues 175,219 158,291 $ 173,495
Costs and Expenses:      
Operating and administrative 172,589 149,662 148,952
Depreciation 8,536 7,938 7,546
Total costs and expenses 181,125 157,600 156,498
Gains (Losses) on Asset Dispositions, Net 1,489 563 (6)
Operating Income (Loss) (4,417) 1,254 16,991
Interest expense (3) (61) (106)
Other expense, net 0 (375) (300)
Income tax expense (2,240) 0 0
Net Income (Loss) (6,660) 818 16,585
All Equity Method Investments Excluding Trailer Bridge      
Balance Sheet [Abstract]      
Current assets 259,498 234,298  
Noncurrent assets 220,967 214,930  
Current liabilities 197,419 171,765  
Noncurrent liabilities 132,021 118,130  
Income Statement [Abstract]      
Operating Revenues 1,262,122 1,060,676 841,203
Costs and Expenses:      
Operating and administrative 1,241,841 1,045,132 817,235
Depreciation 14,736 14,995 25,117
Total costs and expenses 1,256,577 1,060,127 842,352
Gains (Losses) on Asset Dispositions, Net 76 0 38
Operating Income (Loss) 5,621 549 (1,111)
Net Income (Loss) $ (18,109) $ (8,643) $ (14,161)