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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 17,581 $ 23,138 $ 44,779 $ 36,172
Construction        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 16,668 21,078 42,583 31,169
Design        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 655 1,826 1,719 4,539
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 258 234 477 464
GMP        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 9,539 18,317 30,025 24,906
FFP        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 6,288 4,587 12,723 10,785
Cost-plus fee        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues 1,496 0 1,554 17
Other        
Disaggregation of Revenue [Line Items]        
Construction contract and other service revenues $ 258 $ 234 $ 477 $ 464