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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Data [Table Text Block] | Summarized quarterly financial data for the years ended December 31, 2017 and 2016, is as follows:
(in thousands, except per share amounts) | First |  | Second |  | Third |  | Fourth |  | Total (a)
2017: |  |  |  |  |  |  |  |  |
Revenues | $ | 219,521 |  |  | $ | 223,370 |  |  | $ | 228,178 |  |  | $ | 229,827 |  |  | $ | 900,896 |
Net income attributable to common shareholders | 34,861 |  |  | 39,188 |  |  | 34,384 |  |  | 87,989 |  |  | 196,422 |
Net income attributable to common shareholders per share – basic | 0.39 |  |  | 0.43 |  |  | 0.38 |  | (b) | 0.92 |  | (c) | 2.14 |
Net income attributable to common shareholders per share – diluted | 0.39 |  |  | 0.43 |  |  | 0.38 |  | (b) | 0.91 |  | (c) | 2.13 |
2016: |  |  |  |  |  |  |  |  |
Revenues | $ | 217,595 |  |  | $ | 221,478 |  |  | $ | 220,235 |  |  | $ | 217,139 |  |  | $ | 876,447 |
Net income attributable to common shareholders | 41,730 |  |  | 446,302 |  |  | 290,898 |  |  | 40,893 |  |  | 819,823 |
Net income attributable to common shareholders per share – basic | 0.46 |  |  | 4.94 |  | (d) | 3.23 |  | (e) | 0.45 |  |  | 9.08 |
Net income attributable to common shareholders per share – diluted | 0.46 |  |  | 4.92 |  | (d) | 3.21 |  | (e) | 0.45 |  |  | 9.05 |
(a) | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income per share amounts may not equal the total computed for the year.
(b) | Includes a $4,987, or $0.05 basic and diluted per share, impact related to expenses due to Hurricanes Harvey and Irma.
(c) | Includes a $43,231, or $0.46 basic and $0.45 diluted per share, impact related to a gain on sale of one operating property.
(d) | Includes a $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
(e) | Includes a $262,719, or $2.93 basic and $2.92 diluted per share, impact related to a gain on sale of one dual-phased operating property and five other operating properties.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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