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Organization And Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Organization And Significant Accounting Policies [Abstract]
Interest paid, including interest capitalized	$ 7,557	$ 9,625
Income tax payments (refunds), net	(11)	16
Dividends and distributions payable	11,837	9,977
Conversion of redeemable common units for shares	222
Common stock 401k matching contribution	639	655
Construction cost accruals, increase (decrease)	3,875	(1,407)
Adjustments to equity related to redeemable common units, net	$ (440)	$ (536)

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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- Definition

Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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