Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets
Corporate loans, held for sale (in dollars)	$ 107,395	$ 128,289
Equity investments, at estimated fair value, pledged as collateral (in dollars)	$ 9,746	$ 7,187
Preferred shares, no par value
Preferred shares, shares authorized	50,000,000	50,000,000
Preferred shares, shares issued	14,950,000	0
Preferred shares, shares outstanding	14,950,000	0
Common shares, no par value
Common shares, shares authorized	500,000,000	500,000,000
Common shares, shares issued	204,784,871	178,437,078
Common shares, shares outstanding	204,784,871	178,437,078