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Investments by Category and Level (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Available-for-sale Securities	$ 985,458	$ 1,001,970
US Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities
Available-for-sale Securities	130,425	120,816
Foreign Government Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,516	4,071
US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	134,382	133,751
Public Utility, Bonds
Schedule of Available-for-sale Securities
Available-for-sale Securities	29,980	25,334
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	292,329	288,872
Mortgage Backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	288,212	251,903
Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	56,657	57,129
Redeemable Preferred Stock
Schedule of Available-for-sale Securities
Available-for-sale Securities	6,510	2,985
Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	940,011	884,861
Mutual Fund
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	152	65,453
Public Utility, Equities
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	3,663
Common Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	44,492
Nonredeemable Preferred Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	7,293	3,002
Equity Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	7,445	116,610
Equity Securities, FV-NI	7,445	116,610
Other Long-term Investments
Schedule of Available-for-sale Securities
Available-for-sale Securities	38,002	499
Level 1
Schedule of Available-for-sale Securities
Available-for-sale Securities	9,299	117,657
Level 1 | US Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Foreign Government Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Public Utility, Bonds
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 1 | Corporate Debt 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 Stock
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,554	747
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,554	747
Level 1 | Mutual Fund
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	152	65,453
Level 1 | Public Utility, Equities
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	3,663
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	44,492
Level 1 | Nonredeemable Preferred Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	7,293	3,002
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	7,445	116,610
Level 1 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	300	300
Level 2
Schedule of Available-for-sale Securities
Available-for-sale Securities	976,159	884,313
Level 2 | US Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities
Available-for-sale Securities	130,425	120,816
Level 2 | Foreign Government Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,516	4,071
Level 2 | US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	134,382	133,751
Level 2 | Public Utility, Bonds
Schedule of Available-for-sale Securities
Available-for-sale Securities	29,980	25,334
Level 2 | Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	292,329	288,872
Level 2 | Mortgage Backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	288,212	251,903
Level 2 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	56,657	57,129
Level 2 | Redeemable Preferred Stock
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,956	2,238
Level 2 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	938,457	884,114
Level 2 | Mutual Fund
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 2 | Public Utility, Equities
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 2 | Common Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 2 | Nonredeemable Preferred Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 2 | Equity Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 2 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	37,702	199
Level 3
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | US Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Foreign Government Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | US States and Political Subdivisions Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Public Utility, Bonds
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Corporate Debt 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 Stock
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 | Mutual Fund
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 3 | Public Utility, Equities
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 3 | Common Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 3 | Nonredeemable Preferred Stock
Schedule of Available-for-sale Securities
Equity Securities, FV-NI	0	0
Level 3 | Equity Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	0	0
Level 3 | Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	$ 0	$ 0

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