Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Investments in real estate, variable interest entity	$ 21,423	$ 0
Allowances on accounts receivable	374	639
Lease intangibles, variable interest entity	3,485	0
Mortgage loans payable, variable interest entity	23,184	0
Notes payable, variable interest entity	$ 876	$ 0
Series D Cumulative Redeemable Preferred Shares, liquidation preference	$ 25	$ 25
Series D Cumulative Redeemable Preferred Shares, shares authorized	5,060,000	1,840,000
Series D Cumulative Redeemable Preferred Shares, shares outstanding	4,820,000	1,600,000
Common Shares, par value	$ 1	$ 1
Common Shares, unlimited shares authorized
Common Shares, shares issued	33,018,711	33,041,034
Common Shares, shares outstanding	33,018,711	33,041,034