Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified			6 Months Ended	12 Months Ended
	Jul. 31, 2013 Variable interest entities	Jan. 31, 2013 Variable interest entities	Jul. 31, 2013 Series A preferred stock	Jan. 31, 2013 Series A preferred stock	Jul. 31, 2013 Other preferred stock	Jan. 31, 2013 Other preferred stock	Jul. 31, 2013 Common stock Class A	Jan. 31, 2013 Common stock Class A	Jul. 31, 2013 Common stock Class B	Jan. 31, 2013 Common stock Class B
Real Estate, net	$ 1,363,100	$ 1,416,900
Cash and equivalents	26,000	14,200
Restricted cash and escrowed funds	155,300	114,900
Other assets	55,700	92,500
Mortgage debt and notes payable, nonrecourse	546,300	624,100
Senior and subordinated debt	0	29,000
Accounts payable, accrued expenses and other liabilities	$ 82,400	$ 76,200
Preferred stock, dividend rate			7.00%	7.00%
Preferred Stock, without par value			$ 0	$ 0	$ 0	$ 0
Preferred stock, liquidation preference			$ 50	$ 50
Preferred stock, shares authorized			6,400,000	6,400,000	13,600,000	13,600,000
Preferred stock, shares issued			0	211,038	0	0
Preferred stock, shares outstanding			0	211,038
Common stock, par value per share							$ 0.333	$ 0.333	$ 0.333	$ 0.333
Common stock, shares authorized							371,000,000	371,000,000	56,000,000	56,000,000
Common stock, shares issued							178,475,158	163,729,240	20,194,160	20,235,273
Common stock, shares outstanding							177,525,166	163,722,658	20,194,160	20,235,273
Common stock, shares issuable									26,257,961	26,257,961
Treasury stock, Class A shares							949,992	6,582