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Per Share Information (Tables) | 12 Months Ended
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Dec. 31, 2020
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 consisted of the following (in thousands):
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Amounts attributable to common stock: |  |  |  |  |  |
Net income attributable to common stock |  | $ | 445,596 |  |  | $ | 402,044 |  |  | $ | 293,346 |
Weighted average shares: |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock |  | 141,380 |  |  | 145,710 |  |  | 152,963 |
Effect of dilutive unvested non-participating stock-based awards |  | 3,867 |  |  | 1,824 |  |  | 1,263 |
Weighted average shares outstanding for diluted earnings per share attributable to common stock |  | 145,247 |  |  | 147,534 |  |  | 154,226 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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