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Investments - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	$ 922,765	$ 985,458
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	102,216	130,425
Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,985	1,516
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	105,093	134,382
Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	31,066	29,980
Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	299,044	292,329
Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	257,713	288,212
Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	80,163	56,657
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,660	6,510
Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	884,940	940,011
Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0
Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	6,569	7,293
Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	29,407	7,445
Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	8,418	38,002
Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	22,838	152
Level 1
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	24,876	9,299
Level 1 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	814	1,554
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	814	1,554
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0
Level 1 | Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	6,569	7,293
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	23,762	7,445
Level 1 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	300	300
Level 1 | Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	17,193	152
Level 2
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	897,889	976,159
Level 2 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	102,216	130,425
Level 2 | Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,985	1,516
Level 2 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	105,093	134,382
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	31,066	29,980
Level 2 | Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	299,044	292,329
Level 2 | Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	257,713	288,212
Level 2 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	80,163	56,657
Level 2 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	3,846	4,956
Level 2 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	884,126	938,457
Level 2 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0
Level 2 | Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	0	0
Level 2 | Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	5,645	0
Level 2 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	8,118	37,702
Level 2 | Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	5,645	0
Level 3
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	0	0
Level 3 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0
Level 3 | Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	0	0
Level 3 | Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	0	0
Level 3 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	0	0
Level 3 | Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	$ 0	$ 0

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