Stock Compensation Plans and Other Employee Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended				96 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023	May 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for issuance (in shares)						1,200,000
Shares available for future grants (in shares)	1,200,000				1,200,000
Number of stock options granted (in shares)					0
Stock-based compensation expense	$ 33,500,000	$ 31,700,000	$ 16,200,000
Tax benefit (expense) from stock-based compensation arrangements	7,400,000	7,000,000	3,700,000
Aggregate intrinsic value of options exercised	2,500,000	6,700,000	11,700,000
Actual tax benefit realized from option exercises	540,000	1,800,000	3,100,000
Excess tax benefits from stock-based compensation arrangements	2,200,000	5,200,000	14,000,000
Excess (deficit) tax benefit over estimate	1,800,000	580,000	40,000
Unrecognized compensation cost	$ 38,600,000				$ 38,600,000
Unrecognized compensation cost, period for recognition	2 years
Fair value of shares vested	$ 22,100,000	4,500,000	1,500,000
Expense for employer contribution to plan	19,200,000	16,200,000	15,600,000
Cash Incentive and Retention Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense related to plan	0	0	0
Cash awards paid	0	$ 0	$ 0
Cash awards outstanding	$ 0				$ 0
Directors Deferred Fee and Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares authorized (in shares)				200,000
Issued to directors (in shares)	63,001	59,174	23,909
Obligation to issue (in shares)	286,663				286,663
Available for future issuance under DDFS Plan (in shares)	84,864				84,864
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term	10 years
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	746,123	610,155	476,813	234,794	746,123
Restricted Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Restricted Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Performance period	3 years
Shares outstanding (in shares)	553,026	545,379	557,255	482,608	553,026
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	815,000				815,000
LTIP Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts	0.00%
LTIP Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts	150.00%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of purchase price of shares	95.00%
Employee stock purchase plan issuance (in shares)	46,034	40,421	44,021
Compensation expense employee stock purchase plan	$ 0	$ 0	$ 0
Increase in shares authorized (in shares)		200,000
Common stock obligation to issue (in shares)	8,410				8,410
Available for future grants under ESPP (in shares)	166,438				166,438