Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Number of securities	26
Aggregate Fair Value	$ 147,881
Gross Unrealized Loss	16,120
Unrealized Loss Less than 5 Million [Member] | Mortgage-Backed Securities [Member]
Number of securities	14
Aggregate Fair Value	84,813
Gross Unrealized Loss	4,241
Unrealized Loss Less than 5 Million [Member] | Corporate [Member]
Number of securities	6
Aggregate Fair Value	11,763
Gross Unrealized Loss	2,619
Unrealized Loss Less than 5 Million [Member] | State And Municipal [Member]
Number of securities	4
Aggregate Fair Value	32,835
Gross Unrealized Loss	3,667
Unrealized Loss Less than 5 Million [Member] | Foreign [Member]
Number of securities	1
Aggregate Fair Value	1,219
Gross Unrealized Loss	22
Unrealized Loss 5 Million or Greater [Member] | Mortgage-Backed Securities [Member]
Number of securities	1	[1]
Aggregate Fair Value	17,251	[1]
Gross Unrealized Loss	$ 5,571	[1]

[1] This investment is a residential mortgage-backed security that was evaluated based on the performance of the underlying collateral under various economic and default scenarios. The security has met its contractual obligations and the Company expects that it will continue to meet those contractual payment obligations as they become due. Based on this evaluation, the Company does not consider the investment to be OTTI.