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Investments - Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 719	$ 219
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	719	219
Amortized Cost, Due from one through five years	5,705	6,503
Amortized Cost, Due from six through ten years	2,305	2,479
Amortized Cost, Due from eleven through twenty years	1,013	1,014
Amortized Cost, Total	9,742	10,215
Market Value, Current	725	223
Market Value, Due from one through five years	5,784	6,805
Market Value, Due from six through ten years	2,473	2,790
Market Value, Due from eleven through twenty years	1,044	1,102
Market Value, Total	$ 10,026	$ 10,920

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