Annual report pursuant to Section 13 and 15(d)

Construction Contract and Other Service Revenues (Details)

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Construction Contract and Other Service Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues $ 113,763 $ 60,859 $ 102,840
Construction      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 112,170 57,986 94,471
Design      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 612 1,931 7,338
Other      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 981 942 1,031
GMP      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 67,708 34,050 78,401
FFP      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 10,688 20,327 22,607
Cost-plus fee      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues 34,386 5,540 801
Other      
Disaggregation of Revenue [Line Items]      
Construction contract and other service revenues $ 981 $ 942 $ 1,031