Quarterly report pursuant to Section 13 or 15(d)

Construction Contract and Other Service Revenues - Narrative (Details)

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Construction Contract and Other Service Revenues - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Remaining performance obligations $ 82,100,000   $ 82,100,000  
Remaining performance obligation expected to be recognized during the remainder of year 21,000,000   21,000,000  
Construction Contract Revenue        
Disaggregation of Revenue [Line Items]        
Performance obligations satisfied or already satisfied 84,000   158,000 $ 18,000
Deferred incremental costs incurred $ 0 $ 0 $ 0 $ 0