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Summary of Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following table summarizes selected Quarterly Financial Data for the Company on a historical basis for the years ended December 31, 2016 and 2015:
(in thousands except per share and per unit data) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Operating Data: |  |  |  |  |  |  |  |
Revenue |  | $ | 149,628 |  |  | 152,413 |  |  | 152,769 |  |  | 159,561 |
Net income attributable to common stockholders |  | $ | 47,877 |  |  | 34,810 |  |  | 5,305 |  |  | 55,868 |
Net income attributable to exchangeable operating partnership units |  | 85 |  |  | 64 |  |  | 16 |  |  | 92 |
Net income attributable to common unit holders |  | $ | 47,962 |  |  | 34,874 |  |  | 5,321 |  |  | 55,960 |
Net income attributable to common stock and unit holders per share and unit: |  |  |  |  |  |
Basic |  | $ | 0.49 |  |  | 0.36 |  |  | 0.05 |  |  | 0.53 |
Diluted |  | $ | 0.49 |  |  | 0.35 |  |  | 0.05 |  |  | 0.53 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Operating Data: |  |  |  |  |  |  |  |
Revenue |  | $ | 140,399 |  |  | 141,129 |  |  | 142,068 |  |  | 146,167 |
Net income attributable to common stockholders |  | $ | 25,174 |  |  | 32,480 |  |  | 53,731 |  |  | 17,609 |
Net income attributable to exchangeable operating partnership units |  | 49 |  |  | 61 |  |  | 94 |  |  | 36 |
Net income attributable to common unit holders |  | $ | 25,223 |  |  | 32,541 |  |  | 53,825 |  |  | 17,645 |
Net income attributable to common stock and unit holders per share and unit: |  |  |  |  |  |
Basic |  | $ | 0.27 |  |  | 0.35 |  |  | 0.57 |  |  | 0.18 |
Diluted |  | $ | 0.27 |  |  | 0.34 |  |  | 0.57 |  |  | 0.18 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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