Co-Venture Arrangement	12 Months Ended
Dec. 31, 2016
Co-Venture Arrangement [Abstract]
Co-venture Arrangement Disclosure	Co-Venture Arrangement: On September 30, 2009, the Company formed a joint venture, whereby a third party acquired a 49.9% interest in Freehold Raceway Mall, a 1,674,000 square foot regional shopping center in Freehold, New Jersey, and Chandler Fashion Center, a 1,319,000 square foot regional shopping center in Chandler, Arizona. As part of this transaction, the Company issued a warrant in favor of the third party to purchase 935,358 shares of common stock of the Company at an exercise price of $46.68 per share (See "Stock Warrants" in Note 12—Stockholders' Equity). The Company received approximately $174,650 in cash proceeds for the overall transaction, of which $6,496 was attributed to the warrants. The Company used the proceeds from this transaction to pay down its line of credit and for general corporate purposes. As a result of the Company having certain rights under the agreement to repurchase the assets after the seventh year of the venture formation, the transaction did not qualify for sale treatment. The Company, however, is not obligated to repurchase the assets. The transaction has been accounted for as a profit-sharing arrangement, and accordingly the assets, liabilities and operations of the properties remain on the books of the Company and a co-venture obligation was established for the amount of $168,154, representing the net cash proceeds received from the third party less costs allocated to the warrant. The co-venture obligation is increased for the allocation of income to the co-venture partner and decreased for distributions to the co-venture partner. The co-venture obligation was $58,973 and $63,756 at December 31, 2016 and 2015, respectively.

Co-Venture Arrangement:

On September 30, 2009, the Company formed a joint venture, whereby a third party acquired a 49.9% interest in Freehold Raceway Mall, a 1,674,000 square foot regional shopping center in Freehold, New Jersey, and Chandler Fashion Center, a 1,319,000 square foot regional shopping center in Chandler, Arizona. As part of this transaction, the Company issued a warrant in favor of the third party to purchase 935,358 shares of common stock of the Company at an exercise price of $46.68 per share (See "Stock Warrants" in Note 12—Stockholders' Equity). The Company received approximately $174,650 in cash proceeds for the overall transaction, of which $6,496 was attributed to the warrants. The Company used the proceeds from this transaction to pay down its line of credit and for general corporate purposes.

As a result of the Company having certain rights under the agreement to repurchase the assets after the seventh year of the venture formation, the transaction did not qualify for sale treatment. The Company, however, is not obligated to repurchase the assets. The transaction has been accounted for as a profit-sharing arrangement, and accordingly the assets, liabilities and operations of the properties remain on the books of the Company and a co-venture obligation was established for the amount of $168,154, representing the net cash proceeds received from the third party less costs allocated to the warrant. The co-venture obligation is increased for the allocation of income to the co-venture partner and decreased for distributions to the co-venture partner. The co-venture obligation was $58,973 and $63,756 at December 31, 2016 and 2015, respectively.