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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 12,236 $ 42,299 $ 25,917 $ 59,249
Construction        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 10,851 42,010 23,734 58,499
Design        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 1,128 86 1,670 338
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 257 203 513 412
Guaranteed Maximum Price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 5,432 25,792 10,476 38,148
Firm fixed price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 2,984 1,335 8,056 3,660
Cost-plus fee        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 3,563 14,969 6,872 17,029
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 257 $ 203 $ 513 $ 412