Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 713,160	$ 237,606
Restricted cash and cash equivalents	722,104	896,396
Securities	502,196	533,520
Corporate loans, net (includes $107,395 and $128,289 loans held for sale as of March 31, 2013 and December 31, 2012, respectively)	5,838,164	5,947,857
Equity investments, at estimated fair value ($9,746 and $7,187 pledged as collateral as of March 31, 2013 and December 31, 2012, respectively)	185,047	161,621
Oil and gas properties, net	297,516	289,929
Derivative assets	21,694	23,207
Interest and principal receivable	38,977	46,960
Other assets	254,653	221,783
Total assets	8,573,511	8,358,879
Liabilities
Credit facilities	46,089	107,789
Convertible senior notes		166,028
Senior notes	362,202	362,178
Junior subordinated notes	283,517	283,517
Accounts payable, accrued expenses and other liabilities	40,952	25,931
Related party payable	21,706	10,998
Derivative liabilities	100,176	117,270
Total liabilities	6,130,454	6,519,757
Shareholders' Equity
Preferred shares, no par value, 50,000,000 shares authorized and 14,950,000 and zero issued and outstanding at March 31, 2013 and December 31, 2012, respectively	0	0
Common shares, no par value, 500,000,000 shares authorized, and 204,784,871 and 178,437,078 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	0	0
Paid-in-capital	3,311,481	2,762,584
Accumulated other comprehensive loss	(53,543)	(70,226)
Accumulated deficit	(814,881)	(853,236)
Total shareholders' equity	2,443,057	1,839,122
Total liabilities and shareholders' equity	8,573,511	8,358,879
Affiliates
Liabilities
Collateralized loan obligation secured notes	193,921	296,557
Accrued interest payable	5,577	6,632
Nonaffiliates
Liabilities
Collateralized loan obligation secured notes	5,058,520	5,122,338
Accrued interest payable	$ 17,794	$ 20,519