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Selected Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (unaudited) | The following is a summary of our unaudited quarterly results of operations for 2017 and 2016:
| 2017
| First |  | Second |  | Third |  | Fourth
| Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues | $ | 264,561 |  |  | $ | 265,013 |  |  | $ | 266,679 |  |  | $ | 278,566 |
Net income attributable to common shareholders | $ | 32,155 |  |  | $ | 16,042 |  |  | $ | 34,414 |  |  | $ | 65,000 |
Per share data (basic and diluted): |  |  |  |  |  |  |
Net income attributable to common shareholders | $ | 0.14 |  |  | $ | 0.07 |  |  | $ | 0.14 |  |  | $ | 0.27 |
Common distributions declared(1) | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.39 |
| 2016
| First |  | Second |  | Third |  | Fourth
| Quarter |  | Quarter |  | Quarter |  | Quarter
Revenues | $ | 258,375 |  |  | $ | 261,367 |  |  | $ | 263,983 |  |  | $ | 274,296 |
Net income | $ | 31,272 |  |  | $ | 39,233 |  |  | $ | 27,903 |  |  | $ | 42,885 |
Per share data (basic and diluted): |  |  |  |  |  |  |
Net income | $ | 0.13 |  |  | $ | 0.17 |  |  | $ | 0.12 |  |  | $ | 0.18 |
Common distributions declared (1) | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.39 |  |  | $ | 0.39 |
(1) | Amounts represent distributions declared with respect to the periods shown. Distributions are generally paid in the quarterly period following the quarterly period to which they relate.

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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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