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Quarterly Financial Data (unaudited) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Current Fiscal Year End Date |  |  |  |  |  |  |  |  |  |  |  |  | --12-31 |  |  |  |
Revenues | $ | $ 217,139 | $ 220,235 |  | $ 221,478 |  | $ 217,595 | $ 214,985 |  | $ 212,593 | $ 206,432 | $ 201,608 |  | $ 876,447 |  | $ 835,618 |  | $ 790,263
Net income attributable to common shareholders | $ | $ 40,893 | $ 290,898 |  | $ 446,302 |  | $ 41,730 | $ 60,593 |  | $ 37,044 | $ 36,079 | $ 115,599 |  | $ 819,823 |  | $ 249,315 |  | $ 292,089
Total earnings per common share - basic | $ / shares | $ 0.45 | $ 3.23 | [1] | $ 4.94 | [2] | $ 0.46 | $ 0.67 | [3] | $ 0.41 | $ 0.40 | $ 1.29 | [4] | $ 9.08 | [5] | $ 2.77 | [5] | $ 3.29
Total earnings per common share - diluted | $ / shares | $ 0.45 | $ 3.21 | [1] | $ 4.92 | [2] | $ 0.46 | $ 0.67 | [3] | $ 0.41 | $ 0.40 | $ 1.27 | [4] | $ 9.05 | [5] | $ 2.76 | [5] | $ 3.27
Gain (Loss) on Sale of Properties | $ |  | $ 262,719 |  | $ 32,235 |  |  | $ 18,870 |  |  |  | $ 85,192 |  |  |  |  |  |
Income loss due to disposition of operating properties per basic share | $ / shares |  | $ 2.93 |  | $ 0.36 |  |  | $ 0.21 |  |  |  | $ 0.96 |  |  |  |  |  |
Income loss due to disposition of operating properties per diluted share | $ / shares |  | $ 2.92 |  | $ 0.36 |  |  | $ 0.21 |  |  |  | $ 0.94 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 294,900 |  | $ 104,000 |  | $ 155,700
Number of operating properties sold | 6 | 5 |  | 1 |  |  | 3 |  |  |  | 2 |  | 6 |  | 3 |  | 5
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Camden Providence Lakes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  | 1 |  |
Dual-Phase Property Sale [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating properties sold | 1 | 1 |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
[1] | 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.
[2] | Includes a $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
[3] | Includes an $18,870, or $0.21 basic and diluted per share, impact related to a gain on sale of one operating property.
[4] | 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.
[5] | 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.

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