Other Employee Benefits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of gross annual earnings (up to)	60.00%
Percentage vested in salary reduction contributions	100.00%
Discretionary contributions	$ 5,100,000	$ 4,200,000	$ 3,700,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction period (up to)	5 days
Percentage of fair market value	85.00%
Threshold amount of total amount of contributions	$ 21,000
Threshold amount of common stock	$ 25,000
Shares of common stock available (in shares)	80,926