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Employee Deferred Compensation Plan Obligations (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,
2021202020212020
Contribution expense $13,918 $6,730 $23,472 $12,301 
Increase (decrease) in employee deferred compensation expense related to changes in the fair value of trust assets27,810 48,927 39,797 8,551 
$41,728 $55,657 $63,269 $20,852