Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - RAP - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan Investments
RAP Investment Amount	$ 453,457	$ 407,405	$ 497,796
Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	409,771	366,466
Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	43,687	40,939
Money market account
Pension Plan Investments
RAP Investment Amount	10,040	6,628
Money market account | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	10,040	6,628
Money market account | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Money market account | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust
Pension Plan Investments
RAP Investment Amount	164,891	155,654
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	164,891	155,654
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds
Pension Plan Investments
RAP Investment Amount	234,840	204,184
Mutual funds | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	234,840	204,184
Mutual funds | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts
Pension Plan Investments
RAP Investment Amount	43,687	40,939
Group annuity contracts | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	$ 43,687	$ 40,939