Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011
Mortgage-Backed Securities [Member]
Number of Securities	16
Aggregate Fair Value	$ 119,296
Gross Unrealized Loss	8,370
Corporate [Member]
Number of Securities	10
Aggregate Fair Value	73,135
Gross Unrealized Loss	3,778
State And Municipal [Member]
Number of Securities	4
Aggregate Fair Value	37,552
Gross Unrealized Loss	3,590
Foreign [Member]
Number of Securities	30
Aggregate Fair Value	229,983
Gross Unrealized Loss	$ 15,738