Balance Sheet Parenthetical (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Held-to-maturity Securities, Fair Value Disclosure	$ 2,769	$ 2,748
Available-for-sale Debt Securities, Amortized Cost Basis	103,484	120,757
Available-for-sale Equity Securities, Amortized Cost Basis	88,768	114,425
Variable Interest Entity Carrying Amount Of Securities	91,267	94,521
Variable Interest Entity Carrying Amount Of Short Term Investments	0	149,981
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	97,495	96,403
Variable Interest Entity Carrying Amount Of Derivative Assets	1,672	1,602
VIE Other Assets	102,775	105,903
Variable Interest Entity Derivative Liabilities	18,261	19,501
Variable Interest Entity Accounts Payable And Other Liabilities	$ 465	$ 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	150,758,271	150,666,446
Common Stock, Shares, Outstanding	133,290,984	133,199,159
Treasury Stock, Shares	17,467,287	17,467,287