Quarterly report pursuant to Section 13 or 15(d)

Construction Contract and Other Service Revenues (Details 1)

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Construction Contract and Other Service Revenues (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 28,697 $ 8,423 $ 87,946 $ 53,202
Construction        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 27,988 8,160 86,487 50,743
Design        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 484 52 822 1,771
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 225 211 637 688
Guaranteed Maximum Price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 16,217 1,840 54,365 31,865
Firm fixed price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 2,349 3,653 6,009 16,376
Cost-plus fee        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 9,906 2,719 26,935 4,273
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 225 $ 211 $ 637 $ 688