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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Computation of Earnings Per Common Share |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
(in thousands, except per share data) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income to common shareholders |  | $ | 88,277 |  |  | $ | 71,177 |  |  | $ | 167,441 |  |  | $ | 143,652 |
Net income allocated to participating securities - basic and diluted |  |  | 1,502 |  |  |  | 1,328 |  |  |  | 2,839 |  |  |  | 2,694 |
Net income allocated to common shareholders - basic and diluted |  | $ | 86,775 |  |  | $ | 69,849 |  |  | $ | 164,602 |  |  | $ | 140,958 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares - basic |  |  | 85,728 |  |  |  | 85,305 |  |  | $ | 85,708 |  |  | $ | 85,273 |
Dilutive potential common shares |  |  | 107 |  |  |  | 178 |  |  |  | 102 |  |  |  | 178 |
Weighted-average common shares - diluted |  |  | 85,835 |  |  |  | 85,483 |  |  | $ | 85,810 |  |  | $ | 85,451 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.01 |  |  | $ | 0.82 |  |  | $ | 1.92 |  |  | $ | 1.65 |
Diluted |  | $ | 1.01 |  |  | $ | 0.82 |  |  | $ | 1.92 |  |  | $ | 1.65 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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