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Subsequent Events: (Details) $ / shares in Units, ft² in Thousands, $ in Thousands								2 Months Ended
	Apr. 26, 2016 $ / shares	Apr. 19, 2016 shares	Apr. 13, 2016 USD ($) ft²	Feb. 22, 2016 shares	Jan. 19, 2016 $ / shares shares	Nov. 13, 2015 shares	Oct. 30, 2015 $ / shares	Apr. 19, 2016 $ / shares shares	Jan. 20, 2016 shares
Subsequent events
Accelerated shares repurchased, number of shares purchased (shares) | shares				4,222,193	970,609	4,140,788			5,111,397
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)					$ 78.26
Dividend declared (in dollars per share)							$ 2.00
Subsequent event
Subsequent events
Accelerated shares repurchased, number of shares purchased (shares) | shares		861,235						5,083,428
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)								$ 78.69
Dividend declared (in dollars per share)	$ 0.68
Capitola Mall [Member] | Subsequent event
Subsequent events
Property area (in square feet) | ft²			586
Proceeds from sale | $			$ 93,000

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- Definition

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+ References

No definition available.

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- Definition

Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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- Definition

Area of a real estate property.

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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