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Construction Contract and Other Service Revenues (Details) - Construction Contract Revenue - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Performance obligations satisfied or already satisfied $ (14) $ 10 $ 18 $ 319
Remaining performance obligations 48,400   48,400  
Remaining performance obligation expected to be recognized during the remainder of year $ 41,000   $ 41,000