Investments - Schedule of Fair Value of Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Fair value of financial instruments	$ 399,290	$ 381,627
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	99,917	134,434
Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,348	3,354
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments	123,628	91,911
Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	8,189	9,222
Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	131,255	112,616
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,921	1,093
Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	368,258	352,630
Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,624	1,433
Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments	23,782	23,048
Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	2,495	1,506
Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	27,901	25,987
Other Long-Term Investments
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,131	3,010
Level 1
Schedule of Available-for-sale Securities
Fair value of financial instruments	30,122	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	1,921	1,093
Level 1 | Fixed Maturities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,921	1,093
Level 1 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	1,624	1,433
Level 1 | Common Stock
Schedule of Available-for-sale Securities
Fair value of financial instruments	23,782	23,048
Level 1 | Non-Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Fair value of financial instruments	2,495	1,506
Level 1 | Equity Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	27,901	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	367,168	352,276
Level 2 | U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	99,917	134,434
Level 2 | Foreign Government
Schedule of Available-for-sale Securities
Fair value of financial instruments	3,348	3,354
Level 2 | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Fair value of financial instruments	123,628	91,911
Level 2 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	8,189	9,222
Level 2 | Corporate Securities
Schedule of Available-for-sale Securities
Fair value of financial instruments	131,255	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	366,337	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	2,000	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	0
Level 3 | Public Utilities
Schedule of Available-for-sale Securities
Fair value of financial instruments	0	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	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	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	$ 2,000	$ 1,971