Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - RAP - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan Investments
RAP Investment Amount	$ 407,405	$ 497,796	$ 478,849
Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	366,466	448,582
Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	40,939	49,213
Money market account
Pension Plan Investments
RAP Investment Amount	6,628	5,446
Money market account | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	6,628	5,446
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
Mutual funds
Pension Plan Investments
RAP Investment Amount	204,184	257,345
Mutual funds | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	204,184	257,345
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	40,939	49,213
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	40,939	49,213
Defined Benefit Plan, Common Collective Trust
Pension Plan Investments
RAP Investment Amount	155,654	185,791
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	155,654	185,791
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