Commitments and Contingencies	9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Cash Tender At the time of the Company's initial public offering and acquisition of its partnership interest in TRG in 1992, the Company entered into an agreement (the Cash Tender Agreement) with the A. Alfred Taubman Restated Revocable Trust (the Revocable Trust) and TRA Partners (now Taubman Ventures Group LLC or TVG), each of whom owned an interest in TRG, whereby each of the Revocable Trust and TVG (and/or any assignee of the Revocable Trust or TVG) has the right to tender to the Company TRG Units (provided that if the tendering party is tendering less than all of its TRG Units, the aggregate value is at least $50 million) and cause the Company to purchase the tendered interests at a purchase price based on a market valuation of the Company on the trading date immediately preceding the date of the tender (except as otherwise provided below). TVG is controlled by a majority-in-interest among the Revocable Trust and entities affiliated with the children of A. Alfred Taubman (Robert S. Taubman, William S. Taubman, and Gayle Taubman Kalisman). At the election of the tendering party, TRG Units held by members of A. Alfred Taubman’s family and TRG Units held by entities in which his family members hold interests may be included in such a tender. The Company will have the option to pay for these interests from available cash, borrowed funds, or from the proceeds of an offering of common stock. Generally, the Company expects to finance these purchases through the sale of new shares of its common stock. The tendering partner will bear all market risk if the market price at closing is less than the purchase price and will bear the costs of sale. Any proceeds of the offering in excess of the purchase price will be for the sole benefit of the Company. The Company accounts for the Cash Tender Agreement as a freestanding written put option. As the option put price is defined by the current market price of the Company's stock at the time of tender, the fair value of the written option defined by the Cash Tender Agreement is considered to be zero. Based on a market value at September 30, 2018 of $59.83 per share for the Company's common stock, the aggregate value of TRG Units that may be tendered under the Cash Tender Agreement was $1.4 billion. The purchase of these interests at September 30, 2018 would have resulted in the Company owning an additional 28% interest in TRG. Continuing Offer The Company has made a continuing, irrevocable offer (the Continuing Offer) to all present holders of TRG Units (other than a certain excluded holder, currently TVG), permitted assignees of all present holders of TRG Units, those future holders of TRG Units as the Company may, in its sole discretion, agree to include in the Continuing Offer, all existing optionees under the previous option plan and the 2008 Omnibus Plan, and all existing and future optionees under the 2018 Omnibus Plan to exchange shares of common stock for TRG Units. Under the Continuing Offer agreement, one TRG Unit is exchangeable for one share of common stock. Upon a tender of TRG Units, the corresponding shares of Series B Preferred Stock, if any, will automatically be converted into common stock at a ratio of 14,000 shares of Series B Preferred Stock for one share of common stock. Insurance The Company carries liability insurance to mitigate its exposure to certain losses, including those relating to personal injury claims. We believe the Company's insurance policy terms and conditions and limits are appropriate and adequate given the relative risk of loss and industry practice. However, there are certain types of losses, such as punitive damage awards, which may not be covered by insurance, and not all potential losses are insured against. Hurricane Maria and The Mall of San Juan In the third quarter of 2017, The Mall of San Juan experienced certain interior water damage, impacts to exterior landscaping and signage, and significant damage to both Nordstrom and Saks Fifth Avenue as a result of Hurricane Maria. The Company has substantial insurance to cover hurricane and flood damage, as well as business and service interruption. The business interruption coverage commences at time of loss and continues for one year after the damage is fully repaired. The Company's hurricane coverage includes a single deductible of $2 million and policy limits of $900 million, all subject to various terms and conditions. As of September 30, 2018, the Company has not yet received insurance proceeds related to its business interruption claim. The Company has submitted a preliminary claim to its insurer and is currently in discussions related to the amount to be received and timing of payment. During the three and nine months ended September 30, 2018, the Company recorded $0.1 million and $1.1 million, respectively, of insurance recoveries related to reimbursement of expensed costs within Nonoperating Income, Net on the Consolidated Statement of Operations and Comprehensive Income. Additionally, during the nine months ended September 30, 2018, the Company recognized a reduction of $4.9 million of depreciation expense relating to insurance proceeds received for property damage for which the Company took write-offs in 2017. During the three months ended September 30, 2018, the Company did not recognize any such reduction of depreciation expense. During both the three and nine months ended September 30, 2017, the Company recognized an estimated expense of $2.0 million related to property damage, included within depreciation expense. The Company continues to assess physical loss and will update its estimates if necessary. On October 17, 2017, Plaza Internacional Puerto Rico LLC (Plaza Internacional), the owner of The Mall of San Juan (the Mall), filed a civil action in the Commonwealth of Puerto Rico Court of First Instance, San Juan Judicial Center, Superior Court, Civil No. SJ2017CV02094 (503), against Saks Fifth Avenue Puerto Rico, Inc. (Saks PR), and Saks Incorporated (Saks Inc.). The lawsuit asks the court to compel Saks PR and Saks Inc. to immediately remediate and repair the Saks Fifth Avenue store (the Store) that was damaged by Hurricane Maria on September 20, 2017, to reopen the Store on the completion of the reconstruction, and to operate the Store in accordance with the Operating Covenant contained in the Construction, Operation and Reciprocal Easement Agreement among Plaza Internacional, Saks PR, and Nordstrom Puerto Rico LLC (Nordstrom PR) made as of April 23, 2013 (the REA). In response, Saks PR and Saks Inc. filed a Counterclaim, alleging that they have no obligation to repair, remediate, reconstruct, or reopen the Store, asserting various alleged breaches of the REA and other operating agreements. Plaza Internacional filed a motion for a preliminary injunction directing Saks PR to repair, reopen, and operate the Store, but, on March 28, 2018, the Court of First Instance denied Plaza Internacional’s motion, and, on September 12, 2018, the Court of Appeals of Puerto Rico affirmed that ruling, each without prejudging the merits of the substantive claims. Should Saks PR prevail in the action, Nordstrom PR and other Mall tenants may then have the right to terminate their own operating covenants or leases. Plaza Internacional is vigorously prosecuting its claims and defending the Counterclaim. The outcome of the action cannot be predicted, and, at this time, the Company is unable to estimate the amount of loss that could result from an unfavorable outcome. An unfavorable outcome may have a material and adverse effect on the Company's business and its results of operations. Other See Note 5 for the Operating Partnership's guarantees of certain notes payable, including guarantees relating to Unconsolidated Joint Ventures, Note 6 for contingent features relating to certain joint venture agreements, Note 7 for contingent features relating to derivative instruments, and Note 8 for obligations under existing share-based compensation plans.

Commitments and Contingencies

Cash Tender

At the time of the Company's initial public offering and acquisition of its partnership interest in TRG in 1992, the Company entered into an agreement (the Cash Tender Agreement) with the A. Alfred Taubman Restated Revocable Trust (the Revocable Trust) and TRA Partners (now Taubman Ventures Group LLC or TVG), each of whom owned an interest in TRG, whereby each of the Revocable Trust and TVG (and/or any assignee of the Revocable Trust or TVG) has the right to tender to the Company TRG Units (provided that if the tendering party is tendering less than all of its TRG Units, the aggregate value is at least $50 million) and cause the Company to purchase the tendered interests at a purchase price based on a market valuation of the Company on the trading date immediately preceding the date of the tender (except as otherwise provided below). TVG is controlled by a majority-in-interest among the Revocable Trust and entities affiliated with the children of A. Alfred Taubman (Robert S. Taubman, William S. Taubman, and Gayle Taubman Kalisman). At the election of the tendering party, TRG Units held by members of A. Alfred Taubman’s family and TRG Units held by entities in which his family members hold interests may be included in such a tender.

The Company will have the option to pay for these interests from available cash, borrowed funds, or from the proceeds of an offering of common stock. Generally, the Company expects to finance these purchases through the sale of new shares of its common stock. The tendering partner will bear all market risk if the market price at closing is less than the purchase price and will bear the costs of sale. Any proceeds of the offering in excess of the purchase price will be for the sole benefit of the Company. The Company accounts for the Cash Tender Agreement as a freestanding written put option. As the option put price is defined by the current market price of the Company's stock at the time of tender, the fair value of the written option defined by the Cash Tender Agreement is considered to be zero.

Based on a market value at September 30, 2018 of $59.83 per share for the Company's common stock, the aggregate value of TRG Units that may be tendered under the Cash Tender Agreement was $1.4 billion. The purchase of these interests at September 30, 2018 would have resulted in the Company owning an additional 28% interest in TRG.

Continuing Offer

The Company has made a continuing, irrevocable offer (the Continuing Offer) to all present holders of TRG Units (other than a certain excluded holder, currently TVG), permitted assignees of all present holders of TRG Units, those future holders of TRG Units as the Company may, in its sole discretion, agree to include in the Continuing Offer, all existing optionees under the previous option plan and the 2008 Omnibus Plan, and all existing and future optionees under the 2018 Omnibus Plan to exchange shares of common stock for TRG Units. Under the Continuing Offer agreement, one TRG Unit is exchangeable for one share of common stock. Upon a tender of TRG Units, the corresponding shares of Series B Preferred Stock, if any, will automatically be converted into common stock at a ratio of 14,000 shares of Series B Preferred Stock for one share of common stock.

Insurance

The Company carries liability insurance to mitigate its exposure to certain losses, including those relating to personal injury claims. We believe the Company's insurance policy terms and conditions and limits are appropriate and adequate given the relative risk of loss and industry practice. However, there are certain types of losses, such as punitive damage awards, which may not be covered by insurance, and not all potential losses are insured against.

Hurricane Maria and The Mall of San Juan

In the third quarter of 2017, The Mall of San Juan experienced certain interior water damage, impacts to exterior landscaping and signage, and significant damage to both Nordstrom and Saks Fifth Avenue as a result of Hurricane Maria. The Company has substantial insurance to cover hurricane and flood damage, as well as business and service interruption. The business interruption coverage commences at time of loss and continues for one year after the damage is fully repaired. The Company's hurricane coverage includes a single deductible of $2 million and policy limits of $900 million, all subject to various terms and conditions.

As of September 30, 2018, the Company has not yet received insurance proceeds related to its business interruption claim. The Company has submitted a preliminary claim to its insurer and is currently in discussions related to the amount to be received and timing of payment. During the three and nine months ended September 30, 2018, the Company recorded $0.1 million and $1.1 million, respectively, of insurance recoveries related to reimbursement of expensed costs within Nonoperating Income, Net on the Consolidated Statement of Operations and Comprehensive Income. Additionally, during the nine months ended September 30, 2018, the Company recognized a reduction of $4.9 million of depreciation expense relating to insurance proceeds received for property damage for which the Company took write-offs in 2017. During the three months ended September 30, 2018, the Company did not recognize any such reduction of depreciation expense. During both the three and nine months ended September 30, 2017, the Company recognized an estimated expense of $2.0 million related to property damage, included within depreciation expense. The Company continues to assess physical loss and will update its estimates if necessary.

On October 17, 2017, Plaza Internacional Puerto Rico LLC (Plaza Internacional), the owner of The Mall of San Juan (the Mall), filed a civil action in the Commonwealth of Puerto Rico Court of First Instance, San Juan Judicial Center, Superior Court, Civil No. SJ2017CV02094 (503), against Saks Fifth Avenue Puerto Rico, Inc. (Saks PR), and Saks Incorporated (Saks Inc.). The lawsuit asks the court to compel Saks PR and Saks Inc. to immediately remediate and repair the Saks Fifth Avenue store (the Store) that was damaged by Hurricane Maria on September 20, 2017, to reopen the Store on the completion of the reconstruction, and to operate the Store in accordance with the Operating Covenant contained in the Construction, Operation and Reciprocal Easement Agreement among Plaza Internacional, Saks PR, and Nordstrom Puerto Rico LLC (Nordstrom PR) made as of April 23, 2013 (the REA). In response, Saks PR and Saks Inc. filed a Counterclaim, alleging that they have no obligation to repair, remediate, reconstruct, or reopen the Store, asserting various alleged breaches of the REA and other operating agreements. Plaza Internacional filed a motion for a preliminary injunction directing Saks PR to repair, reopen, and operate the Store, but, on March 28, 2018, the Court of First Instance denied Plaza Internacional’s motion, and, on September 12, 2018, the Court of Appeals of Puerto Rico affirmed that ruling, each without prejudging the merits of the substantive claims. Should Saks PR prevail in the action, Nordstrom PR and other Mall tenants may then have the right to terminate their own operating covenants or leases. Plaza Internacional is vigorously prosecuting its claims and defending the Counterclaim. The outcome of the action cannot be predicted, and, at this time, the Company is unable to estimate the amount of loss that could result from an unfavorable outcome. An unfavorable outcome may have a material and adverse effect on the Company's business and its results of operations.

Other

See Note 5 for the Operating Partnership's guarantees of certain notes payable, including guarantees relating to Unconsolidated Joint Ventures, Note 6 for contingent features relating to certain joint venture agreements, Note 7 for contingent features relating to derivative instruments, and Note 8 for obligations under existing share-based compensation plans.