Investments by Category and Level (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 U.S. government and agency securities [Member]	Jun. 30, 2012 U.S. government and agency securities [Member]	Jun. 30, 2013 States, municipalities and political subdivisions [Member]	Jun. 30, 2012 States, municipalities and political subdivisions [Member]	Jun. 30, 2013 Public Utility, Bonds [Member]	Dec. 31, 2012 Public Utility, Bonds [Member]	Jun. 30, 2013 Corporate Debt Securities [Member]	Jun. 30, 2012 Corporate Debt Securities [Member]	Jun. 30, 2012 Redeemable Preferred Stock [Member]	Jun. 30, 2013 Fixed Maturities [Member]	Jun. 30, 2012 Fixed Maturities [Member]	Jun. 30, 2013 Public Utility, Equities [Member]	Dec. 31, 2012 Public Utility, Equities [Member]	Jun. 30, 2013 Common Stock [Member]	Jun. 30, 2012 Common Stock [Member]	Jun. 30, 2013 Nonredeemable Preferred Stock [Member]	Jun. 30, 2012 Nonredeemable Preferred Stock [Member]	Jun. 30, 2013 Equity Securities [Member]	Jun. 30, 2012 Equity Securities [Member]	Jun. 30, 2013 Other Long-term Investments [Member]	Jun. 30, 2012 Other Long-term Investments [Member]	Jun. 30, 2013 Level 1 [Member]	Jun. 30, 2012 Level 1 [Member]	Jun. 30, 2013 Level 1 [Member] U.S. government and agency securities [Member]	Jun. 30, 2012 Level 1 [Member] U.S. government and agency securities [Member]	Jun. 30, 2013 Level 1 [Member] States, municipalities and political subdivisions [Member]	Jun. 30, 2012 Level 1 [Member] States, municipalities and political subdivisions [Member]	Jun. 30, 2013 Level 1 [Member] Public Utility, Bonds [Member]	Dec. 31, 2012 Level 1 [Member] Public Utility, Bonds [Member]	Jun. 30, 2013 Level 1 [Member] Corporate Debt Securities [Member]	Jun. 30, 2012 Level 1 [Member] Corporate Debt Securities [Member]	Jun. 30, 2012 Level 1 [Member] Redeemable Preferred Stock [Member]	Jun. 30, 2013 Level 1 [Member] Fixed Maturities [Member]	Jun. 30, 2012 Level 1 [Member] Fixed Maturities [Member]	Jun. 30, 2013 Level 1 [Member] Public Utility, Equities [Member]	Dec. 31, 2012 Level 1 [Member] Public Utility, Equities [Member]	Jun. 30, 2013 Level 1 [Member] Common Stock [Member]	Jun. 30, 2012 Level 1 [Member] Common Stock [Member]	Jun. 30, 2013 Level 1 [Member] Nonredeemable Preferred Stock [Member]	Jun. 30, 2012 Level 1 [Member] Nonredeemable Preferred Stock [Member]	Jun. 30, 2013 Level 1 [Member] Equity Securities [Member]	Jun. 30, 2012 Level 1 [Member] Equity Securities [Member]	Jun. 30, 2013 Level 1 [Member] Other Long-term Investments [Member]	Jun. 30, 2012 Level 1 [Member] Other Long-term Investments [Member]	Jun. 30, 2013 Level 2 [Member]	Jun. 30, 2012 Level 2 [Member]	Jun. 30, 2013 Level 2 [Member] U.S. government and agency securities [Member]	Jun. 30, 2012 Level 2 [Member] U.S. government and agency securities [Member]	Jun. 30, 2013 Level 2 [Member] States, municipalities and political subdivisions [Member]	Jun. 30, 2012 Level 2 [Member] States, municipalities and political subdivisions [Member]	Jun. 30, 2013 Level 2 [Member] Public Utility, Bonds [Member]	Dec. 31, 2012 Level 2 [Member] Public Utility, Bonds [Member]	Jun. 30, 2013 Level 2 [Member] Corporate Debt Securities [Member]	Jun. 30, 2012 Level 2 [Member] Corporate Debt Securities [Member]	Jun. 30, 2012 Level 2 [Member] Redeemable Preferred Stock [Member]	Jun. 30, 2013 Level 2 [Member] Fixed Maturities [Member]	Jun. 30, 2012 Level 2 [Member] Fixed Maturities [Member]	Jun. 30, 2013 Level 2 [Member] Public Utility, Equities [Member]	Dec. 31, 2012 Level 2 [Member] Public Utility, Equities [Member]	Jun. 30, 2013 Level 2 [Member] Common Stock [Member]	Jun. 30, 2012 Level 2 [Member] Common Stock [Member]	Jun. 30, 2013 Level 2 [Member] Nonredeemable Preferred Stock [Member]	Jun. 30, 2012 Level 2 [Member] Nonredeemable Preferred Stock [Member]	Jun. 30, 2013 Level 2 [Member] Equity Securities [Member]	Jun. 30, 2012 Level 2 [Member] Equity Securities [Member]	Jun. 30, 2013 Level 2 [Member] Other Long-term Investments [Member]	Jun. 30, 2012 Level 2 [Member] Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 241,963	$ 152,180	$ 65,930	$ 95,208	$ 46,565	$ 19,035	$ 9,731	$ 4,360	$ 109,267	$ 30,294	$ 260	$ 231,493	$ 149,157	$ 681	$ 325	$ 9,229	$ 2,140	$ 260	$ 258	$ 10,170	$ 2,723	$ 300	$ 300	$ 10,470	$ 69,993	$ 0	$ 66,710	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 260	$ 0	$ 66,970	$ 681	$ 325	$ 9,229	$ 2,140	$ 260	$ 258	$ 10,170	$ 2,723	$ 300	$ 300	$ 231,493	$ 82,187	$ 65,930	$ 28,498	$ 46,565	$ 19,035	$ 9,731	$ 4,360	$ 109,267	$ 30,294	$ 0	$ 231,493	$ 82,187	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0