Benefit Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 0
Defined Benefit Plan, Benefit Obligation		$ 127,394	$ 182,964	$ 184,410
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.32%	3.23%	3.00%
Expected long-term rate of return on plan assets		6.92%	6.92%
Accumulated benefit obligation for the pension plan		$ 106,300	$ 146,200
Common share purchased under pension plan, shares					115,800
Common share purchased under pension plan, value					$ 7,000
Common share purchased under pension plan, value per share					$ 60.45
Fair value of common shares held by pension plan		$ 16,300	$ 15,900
Fair value of common shares held by pension plan, per share		$ 140.75	$ 137.31
Fair value, pension plan common shares held, shares		115,800	115,800
Defined Benefit Plan, Plan Assets, Amount		$ 209,138	$ 263,473	$ 230,442
Defined Contribution Plan, Cost		4,600	4,300	$ 4,200
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		180,153	226,673
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		28,985	36,800
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit cost		$ 14,200	$ 13,400