Quarterly report pursuant to Section 13 or 15(d)

Construction Contract and Other Service Revenues (Details)

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Construction Contract and Other Service Revenues (Details) - Construction Contract Revenue - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]      
Performance obligations satisfied or already satisfied $ (1) $ 18 $ 318
Remaining performance obligations   27,500  
Remaining performance obligation expected to be recognized during the remainder of year   $ 23,000