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Common Shares | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Common Shares [Text Block] | 4. Common Shares In May 2017, we created an at-the market ("ATM") share offering program through which we can, but have no obligation to, sell common shares having an aggregate offering price of up to $315.3 million (the "2017 ATM program"), in amounts and at times as we determine, into the existing trading market at current market prices as well as through negotiated transactions. Actual sales from time to time may depend on a variety of factors including, among others, market conditions, the trading price of our common shares, and determinations by management of the appropriate sources of funding for us. The proceeds from the sale of our common shares under the 2017 ATM program are intended to be used for general corporate purposes, which may include reducing future borrowings under our $600 million unsecured line of credit, the repayment of other indebtedness, the redemption or other repurchase of outstanding debt or equity securities, funding for development activities, and financing for acquisitions. The following table presents activity under the 2017 ATM program for the year ended December 31, 2017:
(in thousands, except per share amounts) | Year Ended December 31, 2017
Total net consideration | $ | 2,513.6 |
Common shares sold | 28.1 |
Average price per share | $ | 90.44 |
As of the date of this filing, we had common shares having an aggregate offering price of up to $312.8 million remaining available for sale under the 2017 ATM program. No additional shares were sold under the 2017 ATM program subsequent to December 31, 2017 through the date of this filing. In November 2014, we created an ATM share offering program through which we could, but had no obligation to, sell common shares having an aggregate offering price of up to $331.3 million (the "2014 ATM program"). Concurrently with the creation of the 2017 ATM program in May 2017 discussed above, we terminated the 2014 ATM program and rolled the $315.3 million remaining available for sale under the 2014 ATM program into the 2017 ATM program. Upon termination, no further common shares were available for sale under the 2014 ATM program. We have a repurchase plan approved by our Board of Trust Managers which allows for the repurchase of up to $500 million of our common equity securities through open market purchases, block purchases, and privately negotiated transactions. As of the date of this filing, the remaining dollar value of our common equity securities authorized to be repurchased under the program was approximately $269.8 million. There were no repurchases for the years ended December 31, 2017, 2016, or 2015 under this program. We currently have an automatic shelf registration statement which allows us to offer, from time to time, common shares, preferred shares, debt securities, or warrants. Our Amended and Restated Declaration of Trust provides we may issue up to 185 million shares of beneficial interest, consisting of 175 million common shares and 10 million preferred shares. At December 31, 2017, we had approximately 92.7 million common shares outstanding, net of treasury shares and shares held in our deferred compensation arrangements, and no preferred shares outstanding. In September 2017, we issued approximately 4.8 million common shares in a public equity offering and received approximately $442.5 million in net proceeds. We intend to use the net proceeds for general corporate purposes, which may include financing for acquisitions and funding for development activities, reducing borrowings under our $600 million unsecured line of credit, the repayment of indebtedness, and the redemption or other repurchase of outstanding debt or equity securities. In addition to our 2016 quarterly dividends, our Board of Trust Managers declared a special dividend of $4.25 per common share to our common shareholders of record as of September 23, 2016, consisting of gains on dispositions of assets completed in 2016, which was paid on September 30, 2016. We also paid equivalent amounts per unit to holders of the common operating partnership units.

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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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