Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounts Receivable (Details)

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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Other income $ (42,216) $ 2,036 $ 677 [1]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 5,198 21,737 5,377
Additions charged to expense 1,434 (14,578) 16,206 [2]
Additions - other     179
Deductions for uncollectible receivables written off (1,478) (1,950) (25)
Additions charged to expense 1,434 (14,589)  
Ending balance 5,154 5,198 21,737
Puerto Rico Electric Power Authority (PREPA)      
Business Acquisition [Line Items]      
Other income (42,040)    
Accounts receivable, related parties 227,000    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Additions - other     16,000
Oil And Natural Gas Industry      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Additions charged to expense $ 1,400 $ 1,400 $ 200
[1] Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.
[2] (a) Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.