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
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Performance obligations satisfied or already satisfied $ 32 $ 309
Remaining performance obligations 51,600  
Remaining performance obligation expected to be recognized during the remainder of year $ 45,000