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v3.20.1

Summary of Significant Accounting Policies (Revenue Recognition) (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Percentage of total revenue accounted for percentage-of-completion revenue, less than | 0.10% | 0.10% | 0.10%

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- Definition Percentage Of Total Revenue Accounted For Percentage-Of-Completion Revenue + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration