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Note 3 - Operating Property Activities - Disposition Activity (Details) - Disposition Activity Relating to Consolidated Operating Properties and Parcels [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Aggregate sales price	$ 202.5	$ 57.8
Gain on sale of operating properties	50.2	1.7
Impairment charges	$ 2.4	$ 1.2
Number of operating properties sold	19	4
Number of out-parcels sold	1	2

X

- Definition

The number of out-parcels sold during the period.

+ References

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- Definition

The number of properties sold during the period.

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- Definition

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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