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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 42,299 $ 17,581 $ 59,249 $ 44,779
Construction        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 42,010 16,668 58,499 42,583
Design        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 86 655 338 1,719
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 203 258 412 477
Guaranteed Maximum Price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 25,792 9,539 38,148 30,025
Firm fixed price        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 1,335 6,288 3,660 12,723
Cost-plus fee        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 14,969 1,496 17,029 1,554
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 203 $ 258 $ 412 $ 477