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Construction Contract and Other Service Revenues (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | $ 16,950 | $ 27,198
Construction |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 16,489 | 25,915
Design |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 252 | 1,064
Other |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 209 | 219
Guaranteed Maximum Price |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 12,356 | 20,486
Firm fixed price |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 2,325 | 6,435
Cost-plus fee |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | 2,060 | 58
Other |  |
Disaggregation of Revenue [Line Items] |  |
Construction contract and other service revenues | $ 209 | $ 219

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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