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Investments - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	$ 921,562	$ 985,458
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	110,657	130,425
Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,483	1,516
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	122,416	134,382
Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	28,941	29,980
Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	265,683	292,329
Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	274,372	288,212
Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	65,707	56,657
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	6,016	6,510
Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	875,275	940,011
Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	6,914	0
Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	6,952	7,293
Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	19,036	7,445
Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	27,251	38,002
Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	5,170	152
Level 1
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	20,847	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	1,511	1,554
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,511	1,554
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	6,914
Level 1 | Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	6,952	7,293
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	19,036	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	5,170	152
Level 2
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	900,715	976,159
Level 2 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	110,657	130,425
Level 2 | Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,483	1,516
Level 2 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	122,416	134,382
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	28,941	29,980
Level 2 | Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	265,683	292,329
Level 2 | Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	274,372	288,212
Level 2 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	65,707	56,657
Level 2 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,505	4,956
Level 2 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	873,764	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	0	0
Level 2 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	26,951	37,702
Level 2 | Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	0	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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