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Acquisitions: Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended |
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Feb. 17, 2015 USD ($) ft² | Nov. 14, 2014 USD ($) | Oct. 31, 2014 USD ($) | Jun. 04, 2014 USD ($) ft² | Oct. 24, 2013 USD ($) | Apr. 25, 2013 USD ($) a | Jan. 31, 2013 USD ($) | Jan. 24, 2013 USD ($) ft² | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) ft² | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Sep. 17, 2013 ft²
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  |  |  | $ 0 | $ 1,414,659 | $ 257,064 |  |
Deposits paid |  |  |  |  |  |  |  |  | 12,500 | $ 0 | $ 0 |  |
Camelback Colonnade |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 619
Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 73.20%
Additional ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 67.50%
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Green Acres Mall |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 1,799 |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | 325,000 |  |  |  |  |
Placement of mortgage note on the property |  |  |  |  |  |  | $ 225,000 | 100,000 |  |  |  |  |
Deposits paid |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |
Purchase price, balance remaining after deposit |  |  |  |  |  |  |  | $ 470,000 |  |  |  |  |
Green Acres Adjacent |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | a |  |  |  |  |  | 19 |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 22,577 |  |  |  |  |  |  |
Superstition Springs Land I |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 46,162 |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  | 23,662 |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  | $ 22,500 |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  | 33.30% |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Cascade Mall |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 589 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 15,233 |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  | 49.00% |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
PPR Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 1,838,886 |  |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  | 672,109 |  |  |  |  |  |  |  |  |  |  |
Issuance restricted common stock |  | $ 1,166,777 |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  | 49.00% |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Inland Center |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² | 866 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 51,250 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition | 26,250 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Incremental revenue generated from acquired property |  |  |  |  |  |  |  |  | 12,829 |  |  |  |
Incremental earnings (loss) of acquired property |  |  |  |  |  |  |  |  | 1,892 |  |  |  |
Additional ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Fashion Outlets of Chicago |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  | 537 |  |  |
Purchase price |  |  | $ 69,987 |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  |  |  |  |  |  | 10,953 |  |  |  |
Noncontrolling interest adjustment |  |  |  |  |  |  |  |  | $ 76,141 |  |  |  |
Purchase price funded by cash payment on acquisition |  |  | 55,867 |  |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  | $ 14,120 |  |  |  |  |  |  |  |  |  |

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- Definition Represents the cash outflow for deposits on the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References No definition available. + Details
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