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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Quarterly Financial Data [Text Block] | 15. Quarterly Financial Data (unaudited) Summarized quarterly financial data, which has been adjusted for discontinued operations as discussed in Note 7, "Acquisitions, Dispositions, Impairment, and Discontinued Operations" for the years ended December 31, 2016 and 2015, is as follows:
(in thousands, except per share amounts) | First |  | Second |  | Third |  | Fourth |  | Total (a)
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 |  | (b) | 3.23 |  | (c) | 0.45 |  |  | 9.08 |
Net income attributable to common shareholders per share – diluted | 0.46 |  |  | 4.92 |  | (b) | 3.21 |  | (c) | 0.45 |  |  | 9.05 |
2015: |  |  |  |  |  |  |  |  |
Revenues | $ | 201,608 |  |  | $ | 206,432 |  |  | $ | 212,593 |  |  | $ | 214,985 |  |  | $ | 835,618 |
Net income attributable to common shareholders | 115,599 |  |  | 36,079 |  |  | 37,044 |  |  | 60,593 |  |  | 249,315 |
Net income attributable to common shareholders per share – basic | 1.29 |  | (d) | 0.40 |  |  | 0.41 |  |  | 0.67 |  | (e) | 2.77 |
Net income attributable to common shareholders per share – diluted | 1.27 |  | (d) | 0.40 |  |  | 0.41 |  |  | 0.67 |  | (e) | 2.76 |
(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 $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
(c) | 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.
(d) | Includes an $85,192, or $0.96 basic and $0.94 diluted per share, impact related to a gain on sale of two operating properties and land.
(e) | Includes an $18,870, or $0.21 basic and diluted per share, impact related to a gain on sale of one operating property.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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