Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase in income taxes resulting from:
Total income tax expense	$ 5,918	$ 7,927	$ 3,380
MTI
Operating Loss Carryforwards
"Expected" tax expense	3,880	6,702	2,223
Increase in income taxes resulting from:
State income taxes, net of federal income tax expense	1,357	1,135	382
Other non-deductible (non-taxable) items	306	(86)	384
Other, net	(65)	(320)	91
Total income tax expense	$ 5,478	$ 7,431	$ 3,080