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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 8,423 $ 29,786 $ 53,202 $ 65,958
Construction        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 8,160 30,004 50,743 61,173
Design        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 52 (450) 1,771 4,089
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 211 232 688 696
GMP        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 1,840 25,235 31,865 50,141
FFP        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 3,653 3,759 16,376 14,544
Cost-plus fee        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 2,719 560 4,273 577
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 211 $ 232 $ 688 $ 696