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Per Share Information (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share Attributable to Common Stock | The amounts used to compute basic and diluted earnings per share attributable to common stock for the three and six months ended June 30, 2019 and 2018 consisted of the following (in thousands):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Amounts attributable to common stock: |  |  |  |  |  |  |  |
Net income attributable to common stock |  | $ | 27,344 |  |  | $ | 74,365 |  |  | $ | 147,832 |  |  | $ | 111,979 |
Weighted average shares: |  |  |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock |  | 145,935 |  |  | 153,325 |  |  | 145,525 |  |  | 154,906 |
Effect of dilutive unvested non-participating stock-based awards |  | 1,306 |  |  | 1,270 |  |  | 1,340 |  |  | 1,206 |
Weighted average shares outstanding for diluted earnings per share attributable to common stock |  | 147,241 |  |  | 154,595 |  |  | 146,865 |  |  | 156,112 |

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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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