Investments - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	$ 987,291	$ 1,001,970
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	109,520	120,816
Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	3,790	4,071
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	129,809	133,751
Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	27,291	25,334
Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	282,695	288,872
Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	262,854	251,903
Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	51,614	57,129
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	6,213	2,985
Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	873,786	884,861
Public Utilities
Schedule of Available-for-sale Securities
Equity securities, fair value	6,255	3,663
Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	45,801	44,492
Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	7,367	3,002
Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	111,915	116,610
Other Long-term Investments
Schedule of Available-for-sale Securities
Other Investments	1,590	499
Mutual Fund
Schedule of Available-for-sale Securities
Equity securities, fair value	52,492	65,453
Level 1
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	114,030	117,657
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	1,815	747
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	1,815	747
Level 1 | Public Utilities
Schedule of Available-for-sale Securities
Equity securities, fair value	6,255	3,663
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	45,801	44,492
Level 1 | Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Equity securities, fair value	7,367	3,002
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Equity securities, fair value	111,915	116,610
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	52,492	65,453
Level 2
Schedule of Available-for-sale Securities
Investment Owned, at Fair Value	873,261	884,313
Level 2 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	109,520	120,816
Level 2 | Foreign Government
Schedule of Available-for-sale Securities
Available-for-sale Securities	3,790	4,071
Level 2 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Available-for-sale Securities	129,809	133,751
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Available-for-sale Securities	27,291	25,334
Level 2 | Corporate Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	282,695	288,872
Level 2 | Mortgage-backed securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	262,854	251,903
Level 2 | Asset-backed Securities
Schedule of Available-for-sale Securities
Available-for-sale Securities	51,614	57,129
Level 2 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Available-for-sale Securities	4,398	2,238
Level 2 | Fixed Maturities
Schedule of Available-for-sale Securities
Available-for-sale Securities	871,971	884,114
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Equity securities, fair value	0	0
Level 2 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0	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	1,290	199
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 | Public Utilities
Schedule of Available-for-sale Securities
Equity securities, fair value	0	0
Level 3 | Common Stock
Schedule of Available-for-sale Securities
Equity securities, fair value	0	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