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Employee Deferred Compensation Plan Obligations - Compensation Expense Related to Qualified and Nonqualified Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Deferred Compensation Plans [Abstract] |  |  |  |
Contribution expense | $ 11,467 | $ 9,753 | $ 34,939 | $ 28,111
Increase (decrease) in employee deferred compensation expense related to changes in the fair value of trust assets | (1,759) | 26,095 | 38,039 | 34,630
Total compensation expense related to qualified defined contribution plans and nonqualified plans | $ 9,708 | $ 35,848 | $ 72,978 | $ 62,741

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- Definition Deferred Compensation Plans + References No definition available. + Details
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- Definition Defined Contribution Plan, (Income) Expense + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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