Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition on Construction Contract and Other Service Revenues (Details 1)

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Revenue Recognition on Construction Contract and Other Service Revenues (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues $ 27,198 $ 13,034
Construction    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 25,915 10,091
Design    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 1,064 2,713
Other    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 219 230
GMP    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 20,486 6,589
FFP    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 6,435 6,198
Cost-plus fee    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues 58 17
Other    
Disaggregation of Revenue [Line Items]    
Construction contract and other service revenues $ 219 $ 230