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Commitments and Contingent Liabilities - Additional Information (Details) - George Mason Sponsorship $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Termination Option One
Increase (decrease) in contractual obligation, termination option	$ 3.5
Termination Option One | Minimum
Contractual obligation, option period	11 years
Termination Option One | Maximum
Contractual obligation, option period	15 years
Termination Option Two
Increase (decrease) in contractual obligation, termination option	$ 3.6
Termination Option Two | Minimum
Contractual obligation, option period	16 years
Termination Option Two | Maximum
Contractual obligation, option period	20 years
Effective June 30, 2025
Option to terminate	10 years
Effective June 30, 2030
Option to terminate	15 years

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- Definition

Represents the option period for a contractual obligation.

+ References

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+ Details

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- Definition

Amount of increase (decrease) in contractual obligations if the contract is terminated.

+ References

No definition available.

+ Details

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- Definition

Amount of time, after which, the company has the option to terminate the agreement.

+ References

No definition available.

+ Details

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- Details

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