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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders' Equity: 2017 Stock Buyback Program: On February 12, 2017, the Company's Board of Directors authorized the repurchase of up to $500,000 of its outstanding common shares as market conditions and the Company’s liquidity warrant. Repurchases may be made through open market purchases, privately negotiated transactions, structured or derivative transactions, including ASR transactions, or other methods of acquiring shares, from time to time as permitted by securities laws and other legal requirements. During the period from February 12, 2017 to December 31, 2017, the Company repurchased a total of 3,627,390 of its common shares for $221,428, representing an average price of $61.01 per share. The Company funded the repurchases from the net proceeds of the sale of Cascade Mall and Northgate Mall (See Note 15—Dispositions), its share of the proceeds from the sale of ownership interests in office buildings at Fashion District Philadelphia and Country Club Plaza (See Note 4—Investments in Unconsolidated Joint Ventures) and from borrowings under its line of credit. There were no repurchases during the three months ended March 31, 2018. At-The-Market Stock Offering Program ("ATM Program"): On August 20, 2014, the Company entered into an equity distribution agreement with a number of sales agents (the "ATM Program") to issue and sell, from time to time, shares of common stock, par value $0.01 per share, having an aggregate offering price of up to $500,000. The ATM Program expired by its terms in August 2017. No shares were sold under the ATM Program.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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