Balance Sheet Parenthetical (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Held-to-maturity Securities, Fair Value Disclosure	$ 2,524	$ 2,748
Available-for-sale Debt Securities, Amortized Cost Basis	72,500	120,757
Available-for-sale Equity Securities, Amortized Cost Basis	88,768	114,425
Variable Interest Entity Carrying Amount Of Securities	0	94,521
Variable Interest Entity Carrying Amount Of Short Term Investments	0	149,981
Variable Interest Entity Carrying Amount Of Other Invested Assets	75,413	0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	98,542	96,403
Variable Interest Entity Carrying Amount Of Derivative Assets	1,750	1,602
VIE Other Assets	100,724	105,903
Variable Interest Entity Derivative Liabilities	75,413	19,501
Variable Interest Entity Accounts Payable And Other Liabilities	$ 390	$ 530
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	325,000,000	325,000,000
Common Stock, Shares, Issued	151,001,568	150,666,446
Common Stock, Shares, Outstanding	133,520,514	133,199,159
Treasury Stock, Shares	17,481,054	17,467,287