Segment Reporting - Reconciliation of Segment Earnings to Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating earnings	$ 2,399	$ 5,771	$ 16,159
General and administrative	(14,932)	(17,718)	(13,701)
Interest expense	(3,384)	(1,287)	(746)
Earnings before income taxes	486	5,405	15,656
Segment operating earnings
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating earnings	17,331	23,489	29,860
General and administrative
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating earnings	0	0	0
General and administrative	(14,932)	(17,718)	(13,701)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest income	1,471	921	243
Interest expense	$ (3,384)	$ (1,287)	$ (746)