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Common Shares | 6 Months Ended
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Jun. 30, 2021
Stockholders' Equity Note [Abstract] |
Common Shares [Text Block] | 4. Common Shares In June 2020, we created an at-the market ("ATM") share offering program through which we can, but have no obligation to, sell common shares for an aggregate offering price of up to $362.7 million (the "2020 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. As of the date of this filing, we had common shares having an aggregate offering price of up to $0.2 million remaining available for sale under the 2020 ATM program. No additional shares were sold subsequent to June 30, 2021 through the date of this filing. Actual sales from time to time depended 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. During the three and six months ended June 30, 2021, we sold an aggregate of approximately 2.9 million common shares at an average price per share of $126.64, for aggregate net consideration of approximately $358.8 million. The proceeds from the sale of our common shares under the 2020 ATM program were used for general corporate purposes, which included funding for development activities and financing for acquisitions. We have a share 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. There were no repurchases during the three and six months ended June 30, 2021. As of the date of this filing, the remaining dollar value of our common equity securities authorized to be repurchased under this program was approximately $269.5 million. We currently have an automatic shelf registration statement which allows us to offer common shares, preferred shares, debt securities, or warrants, and 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 June 30, 2021, we had approximately 100.6 million common shares outstanding, net of treasury shares and shares held in our deferred compensation arrangements, and no preferred shares outstanding.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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