Annual report pursuant to Section 13 and 15(d)

Construction Contract and Other Service Revenues (Deferred Incremental Costs Incurred) (Details)

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Construction Contract and Other Service Revenues (Deferred Incremental Costs Incurred) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Construction contract revenue      
Disaggregation of Revenue [Line Items]      
Deferred incremental costs incurred $ 0 $ 0 $ 0