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Marketable Securities - Maturity Period (Details) $ in Thousands | 5 Months Ended
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Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 37,121
Variable rate demand notes |
Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 4,000
Variable rate demand notes | Minimum |
Debt Securities, Available-for-sale [Line Items] |
Contractual maturities (in years) | 27 years
Settlement basis period (in days) | 1 day
Effective maturity period (in days) | 1 day
Variable rate demand notes | Maximum |
Debt Securities, Available-for-sale [Line Items] |
Contractual maturities (in years) | 30 years
Settlement basis period (in days) | 7 days
Effective maturity period (in days) | 9 days

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