Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Number of securities	28
Aggregate Fair Value	$ 132,601
Gross Unrealized Loss	9,108
Unrealized Loss Less than 5 Million [Member] | Mortgage-Backed Securities [Member]
Number of securities	13
Aggregate Fair Value	71,135
Gross Unrealized Loss	4,908
Unrealized Loss Less than 5 Million [Member] | Corporate [Member]
Number of securities	11
Aggregate Fair Value	28,841
Gross Unrealized Loss	2,003
Unrealized Loss Less than 5 Million [Member] | State And Municipal [Member]
Number of securities	4
Aggregate Fair Value	32,625
Gross Unrealized Loss	$ 2,197