Investments - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Fair value of financial instruments	$ 445,738	$ 381,627
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	118,730	134,434
Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,391	3,354
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments	137,555	91,911
Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	9,107	9,222
Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	147,805	112,616
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,811	1,093
Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	418,399	352,630
Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,711	1,433
Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments	20,248	23,048
Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	2,344	1,506
Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	24,303	25,987
Other Long-Term Investments
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,036	3,010
Level 1
Schedule of Available-for-sale Securities
Fair value of financial instruments	26,414	27,380
Level 1 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 1 | Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 1 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 1 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 1 | Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 1 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,811	1,093
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,811	1,093
Level 1 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,711	1,433
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments	20,248	23,048
Level 1 | Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	2,344	1,506
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	24,303	25,987
Level 1 | Other Long-Term Investments
Schedule of Available-for-sale Securities
Fair value of financial instruments	300	300
Level 2
Schedule of Available-for-sale Securities
Fair value of financial instruments	417,419	352,276
Level 2 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	118,730	134,434
Level 2 | Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,391	3,354
Level 2 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments	137,555	91,911
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	9,107	9,222
Level 2 | Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	147,805	112,616
Level 2 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 2 | Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	416,588	351,537
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 2 | Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 2 | Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 2 | Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 2 | Other Long-Term Investments
Schedule of Available-for-sale Securities
Fair value of financial instruments	831	739
Level 3
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,905	1,971
Level 3 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments		0
Level 3 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments		0
Level 3 | Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments		0
Level 3 | Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments		0
Level 3 | Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	0
Level 3 | Other Long-Term Investments
Schedule of Available-for-sale Securities
Fair value of financial instruments	$ 1,905	$ 1,971