Investments (Trading Account Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Amortized Cost	$ 22,357		$ 10,730
Fair Value	23,639		11,376
Corporate Debt Securities [Member]
Fair Value	12,432
Asset-backed Securities [Member]
Fair Value	3,988		4,008
Commercial Mortgage Backed Securities [Member]
Fair Value	3,260		4,091
Fixed Maturities [Member]
Amortized Cost	19,274		7,647
Fair Value	19,680		8,099
Equity Securities [Member]
Amortized Cost	3,083	[1]	3,083	[1]
Fair Value	$ 3,959	[1]	$ 3,277	[1]

[1] Included in equity securities are perpetual preferred stock securities that have characteristics of both debt and equity securities.