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Fair Value Measurements (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) derivative_instrument | Mar. 31, 2016 USD ($) mall derivative_instrument | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) derivative_instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Long-term debt, fair value | $ 4,980,818 | $ 4,980,818 |  |  | $ 4,945,622
Mortgage and other indebtedness, net | 4,683,487 | $ 4,683,487 |  |  | $ 4,710,628
Holding period (up to) (in years) |  | 10 years |  |  |
Loss on impairment |  | $ 19,685 |  | $ 0 |
Fair value of real estate investments | $ 57,200 | 57,200 |  |  |
Outparcel Sale |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loss on impairment |  | $ 171 |  |  |
River Ridge Mall |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Percentage of equity interest in real estate property | 25.00% | 25.00% |  |  |
Bonita Lakes, Midland Mall and Ridge River Mall |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loss on impairment |  | $ 19,514 | $ 19,514 |  |
Number of malls with impairment | mall |  | 3 |  |  |
Bonita Lakes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net proceeds from sale of real estate |  | $ 5,323 |  |  |
Fair value of real estate investments | $ 28,000 | 28,000 |  |  |
Midland Mall |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loss on impairment |  | 4,681 |  |  |
Fair value of real estate investments | 29,200 | 29,200 |  |  |
River Ridge Mall |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of real estate investments | 20,033 | $ 20,033 |  |  |
Reserve for capital expenditures | $ 2,100 |  |  |  |
Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Capitalization rate (as a percent) |  | 9.00% |  |  |
Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Capitalization rate (as a percent) |  | 12.00% |  |  |
Interest Rate Swap |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Number of Instruments | derivative_instrument | 4 | 4 |  |  | 4

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