v2.4.0.6

Significant Transactions During the First Quarter of 2013 and Subsequent Events (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jan. 31, 2013 Annaliese [Member] Unit	Feb. 28, 2013 Fox Plaza [Member] Unit
Acquisitions [Abstract]
Cost of acquired entity			$ 19,000,000	$ 135,000,000
Number of units			56	444
Common stock [Abstract]
Number of common shares sold (in shares)	817,445
Proceeds from sale of common shares	122,905,000
Average price per share of common shares sold (dollars per share)	$ 151.82
Unsecured Bond Offering [Abstract]
Aggregate principal amount of debt issued	300,000,000
Coupon Rate (in hundredths)	3.25%
Net proceeds from issuance of notes	295,200,000
Dispositions [Abstract]
Sale of land held for future development	9,100,000
Gain on sale of land	$ 1,503,000	$ 0

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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