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Summary of Significant Accounting Policies - Company's Income from Investments Held in Employee Deferred Compensation Trusts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounting Policies [Abstract] |  |  |  |
Dividend income | $ (4,565) | $ (443) | $ (7,414) | $ (1,887)
Realized and unrealized (gains) losses | 6,324 | (25,652) | (30,625) | (32,743)
(Income) loss from investments held in employee deferred compensation trusts | $ 1,759 | $ (26,095) | $ (38,039) | $ (34,630)

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- Definition Deferred Compensation Plan, Dividend Income + References No definition available. + Details
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- Definition Deferred Compensation Plan, Investment Income + References No definition available. + Details
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- Definition Deferred Compensation Plan, Realized and Unrealized Gain (Loss) + References No definition available. + Details
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- References No definition available. + Details
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