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Employee Deferred Compensation Plan Obligations (Tables) | 9 Months Ended
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Sep. 30, 2021
Deferred Compensation Plans [Abstract] |
Contribution Plans and Nonqualified Plans | The following table presents the Company’s compensation expense related to its qualified defined contribution plans and nonqualified plans (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
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 |
|  | $ | 9,708 |  |  | $ | 35,848 |  |  | $ | 72,978 |  |  | $ | 62,741 |

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- Definition contribution plans and nonqualified plans [Table Text Block] + References No definition available. + Details
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- Definition Deferred Compensation Plans + References No definition available. + Details
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