Qualified Employee Benefit Plans - Valuation of our Retirement Plan Assets by Pricing Observability Levels (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	$ 63,300
Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	63,325	$ 101,376	$ 95,990
Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		85,474
Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	5,618	23,267
Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	55,839	62,207
Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
NAV Expedient | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	1,868	15,902
Cash | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	5,618	944
Cash | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	5,618	944
Cash | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
Cash | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
U.S. Treasury Strips | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		15,764
U.S. Treasury Strips | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
U.S. Treasury Strips | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		15,764
U.S. Treasury Strips | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Fixed income mutual funds | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		2,271
Fixed income mutual funds | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		2,271
Fixed income mutual funds | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Fixed income mutual funds | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Fixed income securities | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	55,839	46,443
Fixed income securities | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
Fixed income securities | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	55,839	46,443
Fixed income securities | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
Equity mutual funds | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		9,821
Equity mutual funds | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		9,821
Equity mutual funds | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Equity mutual funds | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Equity securities | Fair Value, Inputs, Level 1, 2 and 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		10,231
Equity securities | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		10,231
Equity securities | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
Equity securities | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value		0
NAV Expedient | Level 1 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
NAV Expedient | Level 2 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	0	0
NAV Expedient | Level 3 | Retirement Plan
Defined Benefit Plan, Assets [Abstract]
Total assets measured at fair value	$ 0	$ 0