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Employee Deferred Compensation Plan Obligations | 9 Months Ended
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Sep. 30, 2021
Deferred Compensation Plans [Abstract] |
Employee Deferred Compensation Plan Obligations | Employee Deferred Compensation Plan Obligations The Company provides various qualified defined contribution 401(k) plans covering eligible employees. The plans offer a savings feature with the Company matching employee contributions. Assets of this plan are held by an independent trustee for the sole benefit of participating employees. Nonqualified plans are provided for employees not eligible for the qualified plans. These plans include provisions for salary deferrals and Company matching and discretionary contributions. The asset value of the nonqualified plans was $462.3 million and $406.6 million as of September 30, 2021 and December 31, 2020, respectively. The Company holds these assets to satisfy the Company’s liabilities under its deferred compensation plans. The liability value for the nonqualified plans was $492.1 million and $435.1 million as of September 30, 2021 and December 31, 2020, respectively. 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 |
The Company has statutory defined contribution plans and defined benefit plans outside the U.S., which are not material.

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- Definition Deferred Compensation Plans + References No definition available. + Details
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- Definition Deferred Compensation Plans [Text Block] + References No definition available. + Details
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