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Employee Deferred Compensation Plan Obligations (Tables)
 9 Months Ended
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,
2021202020212020
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