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Retirement Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended			42 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Retirement Benefits [Abstract]
Employer percentage match of employees contribution				100.00%
Employer maximum contribution as a percentage of gross pay				5.00%
Employer matching contributions for retirement plan (in dollars)	$ 5.6	$ 6.8	$ 6.5

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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