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Earnings per Share and Unit (Tables) | 12 Months Ended
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Dec. 31, 2016
Parent Company [Member] |
Schedule of Earnings Per Share, Basic and Diluted | Parent Company Earnings per Share The following summarizes the calculation of basic and diluted earnings per share:
|  | Year ended December 31,
(in thousands, except per share data) |  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |
Income from operations attributable to common stockholders - basic |  | $ | 143,860 |  |  | 128,994 |  |  | 165,875 |
Income from operations attributable to common stockholders - diluted |  | $ | 143,860 |  |  | 128,994 |  |  | 165,938 |
Denominator: |  |  |  |  |  |
Weighted average common shares outstanding for basic EPS |  | 100,863 |  |  | 94,391 |  |  | 92,370 |
Weighted average common shares outstanding for diluted EPS (1) |  | 101,285 |  |  | 94,856 |  |  | 92,404 |
Income per common share – basic |  | $ | 1.43 |  |  | 1.37 |  |  | 1.80 |
Income per common share – diluted |  | $ | 1.42 |  |  | 1.36 |  |  | 1.80 |
Partnership Interest [Member] |
Schedule of Earnings Per Share, Basic and Diluted | Operating Partnership Earnings per Unit The following summarizes the calculation of basic and diluted earnings per unit:
|  | Year ended December 31,
(in thousands, except per share data) |  | 2016 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |
Income from operations attributable to common unit holders - basic |  | $ | 144,117 |  |  | 129,234 |  |  | 166,194 |
Income from operations attributable to common unit holders - diluted |  | $ | 144,117 |  |  | 129,234 |  |  | 166,257 |
Denominator: |  |  |  |  |  |
Weighted average common units outstanding for basic EPU |  | 101,017 |  |  | 94,546 |  |  | 92,528 |
Weighted average common units outstanding for diluted EPU (1) |  | 101,439 |  |  | 95,011 |  |  | 92,562 |
Income per common unit – basic |  | $ | 1.43 |  |  | 1.37 |  |  | 1.80 |
Income per common unit – diluted |  | $ | 1.42 |  |  | 1.36 |  |  | 1.80 |
(1) Includes the dilutive impact of unvested restricted stock and forward equity offering using the treasury stock method.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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