Employee Benefits - Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 263,906	$ 229,701
Actual % of total	100.00%	100.00%
Target allocation	100.00%
Hedge portfolio:
Defined Benefit Plan Disclosure [Line Items]
Target allocation	80.00%
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 166,063	$ 18,102
Actual % of total	62.90%	7.90%
Redeemable preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 2,946
Actual % of total	0.00%	1.30%
Liquid assets separate account fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 4,475	$ 0
Actual % of total	1.70%	0.00%
Core plus bond separate account fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 16,768
Actual % of total	0.00%	7.30%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 785	$ 5,356
Actual % of total	0.30%	2.30%
Return seeking portfolio:
Defined Benefit Plan Disclosure [Line Items]
Target allocation	20.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 53,981	$ 134,663
Actual % of total	20.50%	58.60%
U.S. property separate account fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 25,407	$ 28,468
Actual % of total	9.60%	12.40%
United Life annuity
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 13,195	$ 12,567
Actual % of total	5.00%	5.50%
Arbitrage fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	$ 10,831
Actual % of total	0.00%	4.70%