Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Corporate loans, held for sale (in dollars)	$ 128,289	$ 317,332
Equity investments, at estimated fair value, pledged as collateral (in dollars)	$ 7,187	$ 12,222
Preferred shares, no par value
Preferred shares, shares authorized	50,000,000	50,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common shares, no par value
Common shares, shares authorized	500,000,000	500,000,000
Common shares, shares issued	178,437,078	178,145,482
Common shares, shares outstanding	178,437,078	178,145,482