(Mortgages, Notes and Loans Payable Schedule) (Details) - USD ($)		Mar. 31, 2016		Mar. 30, 2016	Dec. 31, 2015		Dec. 01, 2015	Oct. 31, 2015	Oct. 08, 2015	Sep. 30, 2015	Sep. 11, 2015	Jun. 03, 2015	Feb. 28, 2015	Dec. 31, 2014	Nov. 22, 2013
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 1,255,373,000			$ 1,138,158,000
Market rate adjustments		(760,000)			(340,000)
Fixed-rate debt at fair value					1,137,818,000
Variable-rate debt					568,695,000
Deferred Finance Costs, Current, Net		12,187,000			11,672,000
Total Mortgages, notes and loans payable		1,735,926,000			1,694,841,000
Current borrowing capacity															$ 510,000,000
Vista Ridge Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 64,660,000	[1]		65,611,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	6.87%
The Centre at Salisbury [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt	[1]	$ 0			115,000,000
Variable-rate debt	[2]	97,500,000			0
Total Mortgages, notes and loans payable		$ 97,500,000	[3]	$ 115,574,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	0.00%
Variable-rate debt, interest rate	[2]	3.04%
Gateway Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 75,000,000	[4]		75,000,000
Total Mortgages, notes and loans payable	[5]				75,000,000		$ 0
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[4]	3.64%
The Mall at Turtle Creek [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 76,343,000			76,615,000	[1]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		6.54%
West Valley Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 59,000,000			59,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.24%
Bel Air Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 110,450,000			0
Variable-rate debt	[2]	$ 0			110,450,000
Total Mortgages, notes and loans payable					110,450,000				$ 109,467,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.34%
Variable-rate debt, interest rate	[2]	0.00%
Pierre Bossier Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 45,672,000			45,875,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.94%
Pierre Bossier Anchor [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 3,528,000			3,550,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.85%
Southland Center [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 74,486,000			74,806,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		5.09%
ChesterfieldTowneCenter [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 105,933,000			106,379,000	[4]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.75%
Animas Valley Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 48,924,000			49,156,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.41%
LakelandMall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 66,494,000			66,814,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.17%
Valley Hills [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 65,070,000			65,362,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.47%
Chula Vista Center [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 70,000,000			70,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		4.18%
The Mall at Barnes Crossing [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 67,000,000	[1]		67,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	4.29%
Bay Shore Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 46,500,000	[1]		46,500,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	3.96%
Mt. Shasta Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 31,850,000	[1]		31,850,000
Total Mortgages, notes and loans payable					31,850,000								$ 0
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	4.19%
Fig Garden Village [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 74,200,000			74,200,000	[1],[6]
Total Mortgages, notes and loans payable					74,200,000							$ 0
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	4.14%
GreenvilleMall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 45,263,000			45,440,000	[1],[6]
Total Mortgages, notes and loans payable	[5]				45,500,000				40,171,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	[1]	4.46%
NewPark Mall [Member]
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 125,000,000			0
Variable-rate debt	[2]	$ 0			114,245,000
Total Mortgages, notes and loans payable					114,245,000						$ 64,655,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		3.22%
Variable-rate debt, interest rate	[2]	0.00%
2013 Term Loan [Member]
Mortgages, notes and loans payable [Line Item]
Variable-rate debt	[7],[8]	$ 285,000,000			285,000,000
Variable-rate debt, interest rate	[7],[8]	2.79%
2013 Revolver [Member]
Mortgages, notes and loans payable [Line Item]
Variable-rate debt	[7],[8]	$ 111,000,000			$ 59,000,000
Variable-rate debt, interest rate	[7],[8]	2.79%
London Interbank Offered Rate (LIBOR) [Member]
Mortgages, notes and loans payable [Line Item]
Derivative, basis spread on variable rate		2.10%			2.33%			2.35%		2.10%				1.75%
London Interbank Offered Rate (LIBOR) [Member] | The Centre at Salisbury [Member]
Mortgages, notes and loans payable [Line Item]
Derivative, basis spread on variable rate		0.00%
Secured Debt [Member]
Mortgages, notes and loans payable [Line Item]
Current borrowing capacity					$ 595,000,000									$ 545,000,000
Secured Debt [Member] | 2013 Term Loan [Member]
Mortgages, notes and loans payable [Line Item]
Current borrowing capacity					285,000,000.0									260,000,000	260,000,000
Revolving Credit Facility [Member] | 2013 Term Loan [Member]
Mortgages, notes and loans payable [Line Item]
Current borrowing capacity					285,000,000									260,000,000
Revolving Credit Facility [Member] | 2013 Revolver [Member]
Mortgages, notes and loans payable [Line Item]
Current borrowing capacity					310,000,000.0									$ 285,000,000	$ 250,000,000
Non Recourse Mortgage Loan [Member] | Gateway Mall [Member]
Mortgages, notes and loans payable [Line Item]
Total Mortgages, notes and loans payable							$ 75,000,000
Non Recourse Mortgage Loan [Member] | GreenvilleMall [Member]
Mortgages, notes and loans payable [Line Item]
Total Mortgages, notes and loans payable									$ 45,500,000
Carrying Amount
Mortgages, notes and loans payable [Line Item]
Fixed-rate debt		$ 1,254,613,000			1,137,818,000
Variable-rate debt		493,500,000			568,695,000
Total Mortgages, notes and loans payable		$ 1,748,113,000			$ 1,706,513,000

[1] See the significant property loan refinancings and acquisitions table below, under "—Property-Level Debt" in this Note 5 for additional information regarding the debt related to each property.

[2] LIBOR (30 day) plus 235 basis points.

[3] In October 2015, the loan associated with The Shoppes at Bel Air was refinanced with a new non-recourse mortgage loan for $120.0 million. The initial funding of $110.5 million was used to retire the outstanding mortgage loan of $109.5 million, which had a fixed interest rate of 5.30%. The loan provides for an additional subsequent funding of $9.5 million upon achieving certain conditions. The Company entered into an interest rate swap on this loan which fixed the interest rate at 3.34% through November 2018 (see Note 7 for further details). The loan is interest-only for the first two years.

[4] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjYxMDM4OWJjMjRlZTRiMmI5NWJjMDFjNTUwYTAxNjk3fFRleHRTZWxlY3Rpb246NjFBQTAzQzc3MjNGNTQwMEEzNDk3Q0M0NTc3QkVENzMM}

[5] In March 2016, the loan associated with The Centre at Salisbury was refinanced with a partial non-recourse mortgage loan for $105.0 million. The initial funding of $97.5 million was used to retire the outstanding mortgage loan. The loan bears interest at floating rate of LIBOR (30 day) plus 260 basis points, matures in March 2019 and has a one year extension option.

[6] LIBOR (30 day) plus 260 basis points.

[7] 2015, the Company exercised a portion of its "accordion feature" on the 2013 Senior Facility, increasing the 2013 Term Loan (as defined below) from $260.0 million to $285.0 million and increasing the availability on the 2013 Revolver from $285.0 million to $310.0 million.

[8] 2015, the Company exercised a portion of its "accordion feature" on the 2013 Senior Facility, increasing the 2013 Term Loan (as defined below) from $260.0 million to $285.0 million and increasing the availability on the 2013 Revolver from $285.0 million to $310.0 million.(7) See Note 2 for information related to the adoption of a new accounting pronouncement during the three months ended March 31, 2016 that have been retrospectively applied, resulting in reclassification of certain debt issuance costs from "Deferred expenses, net" to "Mortgages, notes and loan payable, net."