Marketable Securities (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Marketable Securities [Abstract]
Marketable securities received in connection with the sale of real estate	$ 30,000,000	$ 0	$ 0
Macerich Interest [Member]
Marketable Securities [Abstract]
Fair Value	31,206,000
GAAP Cost	30,000,000
Unrealized Gain	$ 1,206,000
Economic basis per share	$ 56.05
Closing share price	$ 58.30
Percentage of outstanding common shares owned	0.39%
Macerich common shares	535,265

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details