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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Data [Text Block] | 16. Quarterly Financial Data (unaudited) Summarized quarterly financial data for the years ended December 31, 2018 and 2017, is as follows:
(in thousands, except per share amounts) | First |  | Second |  | Third |  | Fourth |  | Total (a)
2018: |  |  |  |  |  |  |  |  |
Revenues | $ | 230,683 |  |  | $ | 237,133 |  |  | $ | 241,770 |  |  | $ | 244,919 |  |  | $ | 954,505 |
Net income attributable to common shareholders | 39,395 |  |  | 38,671 |  |  | 38,866 |  |  | 39,196 |  |  | 156,128 |
Net income attributable to common shareholders per share – basic | 0.41 |  |  | 0.40 |  |  | 0.41 |  |  | 0.41 |  |  | 1.63 |
Net income attributable to common shareholders per share – diluted | 0.41 |  |  | 0.40 |  |  | 0.40 |  |  | 0.41 |  |  | 1.63 |
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 |
(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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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