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)

v3.8.0.1
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets $ 523,343 $ 573,035  
Noncurrent assets 124,733 141,549  
Current liabilities 407,812 526,830  
Noncurrent liabilities 81,899 27,461  
Operating Revenues 1,068,190 1,019,658 $ 869,973
Costs and Expenses: Operating and administrative 1,035,952 951,019 794,120
Costs and Expenses: Depreciation 11,810 24,936 37,511
Total costs and expenses 1,047,762 975,955 831,631
Gain (Loss) on Asset Dispositions 16,115 (6,339) 27
Operating Income 36,543 37,364 38,369
Net Income (Loss) 23,383 4,961 19,831
SCFCo Holdings      
Current assets 7,924 8,549  
Noncurrent assets 137,224 154,186  
Current liabilities 14,263 14,825  
Noncurrent liabilities 54,179 59,601  
Operating Revenues 44,177 43,711 82,835
Costs and Expenses: Operating and administrative 40,106 38,980 73,587
Costs and Expenses: Depreciation 17,803 17,560 17,751
Total costs and expenses 57,909 56,540 91,338
Gain (Loss) on Asset Dispositions (13,732) (12,829) (8,503)
Equity Method Investment, Summarized Financial Information, Interest Expense (6,120) (6,565) (10,514)
Equity Method Investment, Summarized Financial Information, Interest Expense, Net (961) (657) (2,141)
Net Income (Loss) $ (20,813) $ (20,051) (21,158)
Dorian LPG [Member]      
Operating Revenues     239,206
Operating Income     126,820
Net Income (Loss)     $ 118,356