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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

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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