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Revenue Recognition on Construction Contract and Other Service Revenues (Details) - Construction Contract Revenue $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) compensation_arrangement | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) compensation_arrangement | Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Number of compensation arrangement types | compensation_arrangement | 3 |  | 3 |
Performance obligations satisfied or already satisfied | $ (1) | $ 47 | $ 318 | $ 594
Customers payment period |  |  | 30 days |
Remaining performance obligations | 13,700 |  | $ 13,700 |
Remaining performance obligation expected to be recognized during the remainder of year | $ 8,000 |  | $ 8,000 |

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- Definition Revenue from Contract with Customer, Construction Contracts, Number of Compensation Arrangement Types + References No definition available. + Details
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- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 + Details
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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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