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Property, net - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Real Estate [Abstract] |  |  |  |
Depreciation expense | $ 66,850 | $ 69,364 | $ 134,794 | $ 138,320
Property, Plant and Equipment [Line Items] |  |  |  |
(Loss) gain on sale or write down of assets, net | (9,518) | $ (477) | (47,030) | 49,088
Write down of investment |  |  |  | (10,138)
Cascade and Northgate Malls |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gain (loss) on disposal |  |  |  | $ 59,713
Two freestanding stores |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment loss | 7,494 |  | 7,479 |
Southridge Center |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment loss | 1,660 |  | 1,660 |
South Park Mall |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment loss |  |  | 36,338 |
Promenade at Casa Grande |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
(Loss) gain on sale or write down of assets, net |  |  | 311 |
Impairment loss |  |  | $ 1,043 |
Gain (loss) on disposal | $ (311) |  |  |

X
- Definition The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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