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) - Construction Contract Revenue - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Remaining performance obligations $ 176,600,000  
Remaining performance obligation expected to be recognized during the remainder of year 74,000,000  
Deferred incremental costs incurred $ 0 $ 0