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Investments in Unconsolidated Joint Ventures: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended			9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended		9 Months Ended				9 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Oct. 03, 2012 FlatIron Crossing sqft	Oct. 26, 2012 Arrowhead Towne Center sqft	Mar. 30, 2012 Chandler Village Center, LLC sqft	Sep. 30, 2012 Chandler Village Center, LLC	Mar. 30, 2012 Chandler Festival sqft	Sep. 30, 2012 Chandler Festival	Mar. 30, 2012 SanTan Village Power Center sqft	Sep. 30, 2012 SanTan Village Power Center	May 31, 2012 Chandler Gateway sqft	Sep. 30, 2012 Chandler Gateway	Aug. 10, 2012 NorthPark Center sqft	Sep. 30, 2013 Pacific Premier Retail LP	Sep. 30, 2012 Pacific Premier Retail LP	Sep. 30, 2013 Pacific Premier Retail LP	Sep. 30, 2012 Pacific Premier Retail LP	Sep. 17, 2013 Camelback Colonnade	Sep. 16, 2013 Camelback Colonnade	Sep. 30, 2013 Redmond Town Center	Aug. 01, 2013 Redmond Town Center Pacific Premier Retail LP sqft	May 29, 2013 Redmond Town Center Pacific Premier Retail LP sqft	Sep. 30, 2013 Redmond Town Center Pacific Premier Retail LP	Sep. 30, 2013 Redmond Town Center Pacific Premier Retail LP	Jun. 12, 2013 Kitsap Mall Pacific Premier Retail LP sqft	Sep. 30, 2013 Kitsap Mall Pacific Premier Retail LP
Investments in unconsolidated joint ventures:
Percentage of ownership interest sold							50.00%		50.00%				50.00%
Gain (loss) on remeasurement, sale or write down of assets, net	$ 38,104	$ (28)	$ 183,154	$ 22,938							$ 23,294					$ 38,432	$ 0	$ 182,781	$ (10)				$ 38,471	$ 89,155			$ 55,155
Proceeds from sale of assets			327,059	130,691			6,045		16,183				4,921
Mortgage notes payable settled by deed-in-lieu of foreclosure			84,000	185,000			8,750		14,792				9,394
Property area (in square feet)					1,435,000	1,196,000	273,000		500,000		491,000		260,000		1,946,000								695,000	582,000			846,000
Ownership percentage																					73.20%
Purchase price on acquisition					310,397	144,400
Proceeds from sale of property											54,780												127,000	185,000			127,000
Purchase price funded by cash payment on acquisition					195,900	69,025
Purchase price paid through assumption of debt by the Company			109,858	0	114,497	75,375
Consideration received on sale of joint venture interest							14,795		30,975				14,315		118,810
Gain on sale of investments in unconsolidated entity								8,185		12,347				3,365	24,590
Additional ownership interest acquired (as a percent)					75.00%	33.30%														67.50%
Loan paid off											45,000
Cash distributed to the partners											9,780
Gain on sale of property, pro rata share												11,502										18,263			18,263	44,424		28,129
Gain on sale of property, pro rata share included in net income attributable to noncontrolling interests												$ (3,565)

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