Construction Contract and Other Service Revenues (Narrative) (Details) |
12 Months Ended | ||
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Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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Construction contract revenue | Revenue from Contract with Customer Benchmark | Concentration risk | United States Government | |||
Concentration Risk [Line Items] | |||
Percentage of revenue | 74.00% | 95.00% | 98.00% |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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