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)

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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet [Abstract]      
Current assets $ 228,420 $ 184,704  
Noncurrent assets 101,292 77,929  
Current liabilities 160,688 113,784  
Noncurrent liabilities 58,413 46,503  
Income Statement [Abstract]      
Operating Revenues 1,015,627 786,717 $ 1,068,190
Costs and Expenses:      
Operating and administrative 1,005,757 771,324 1,035,952
Depreciation 4,968 7,216 11,810
Total costs and expenses 1,010,725 778,540 1,047,762
Gains on Asset Dispositions and Impairments, Net 0 38 16,115
Operating Income (Loss) 4,902 8,215 36,543
Net Income (Loss) 2,922 3,967 23,383
SCFCo      
Balance Sheet [Abstract]      
Current assets 5,878 8,322  
Noncurrent assets 113,638 121,001  
Current liabilities 11,077 12,958  
Noncurrent liabilities 59,717 56,078  
Income Statement [Abstract]      
Operating Revenues 45,049 54,486 44,177
Costs and Expenses:      
Operating and administrative 39,375 45,911 40,106
Depreciation 10,027 17,901 17,803
Total costs and expenses 49,402 63,812 57,909
Operating Income (Loss) (4,353) (9,326) (13,732)
Interest expense (6,971) (6,573) (6,120)
Other expense, net (241) (2,229) (961)
Net Income (Loss) $ (11,565) $ (18,128) $ (20,813)