Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Number Of Securities	35
Aggregate Fair Value	$ 213,757
Gross Unrealized Loss	21,299
Unrealized Loss 5 Million or Greater [Member] | Mortgage-Backed Securities [Member]
Number Of Securities	1	[1]
Aggregate Fair Value	15,945	[1]
Gross Unrealized Loss	7,158	[1]
Unrealized Loss Less than 5 Million [Member] | Mortgage-Backed Securities [Member]
Number Of Securities	15
Aggregate Fair Value	106,923
Gross Unrealized Loss	6,115
Unrealized Loss Less than 5 Million [Member] | Corporate [Member]
Number Of Securities	13
Aggregate Fair Value	48,106
Gross Unrealized Loss	3,461
Unrealized Loss Less than 5 Million [Member] | State and Municipal [Member]
Number Of Securities	5
Aggregate Fair Value	42,197
Gross Unrealized Loss	4,553
Unrealized Loss Less than 5 Million [Member] | Foreign [Member]
Number Of Securities	1
Aggregate Fair Value	586
Gross Unrealized Loss	$ 12

[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.