Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Amortization of defined benefit pension items
Prior service cost		$ 5	$ 5	$ 10	$ 10
Actuarial losses		94	109	188	238
Total before tax		99	114	198	248
Tax benefit	[1]	(26)	(30)	(52)	(65)
Net current period other comprehensive (loss) income		$ 73	$ 84	$ 146	$ 183

[1] These amounts were included in the computation of pension expense. See Note 7 for additional details.