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Earnings Per Share Level 1 (Notes) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings Per ShareBasic earnings per common share (EPS) excludes dilution and is computed by dividing Net income attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other obligations to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that shared in our earnings. A reconciliation of the numerators and denominators of basic and diluted EPS is presented below:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands, except per share amounts)
Amounts attributable to common stockholders: |  |  |  |  |
Net income — basic and diluted | 515,907 |  |  | 369,596 |  |  | 447,208 |
Weighted average shares: |  |  |  |  |
Weighted average shares — basic | 176,709 |  |  | 182,246 |  |  | 182,447 |
Stock options | 2,234 |  |  | 3,223 |  |  | 4,339 |
Restricted share units | 47 |  |  | 54 |  |  | 186 |
Weighted average shares — diluted | 178,990 |  |  | 185,523 |  |  | 186,972 |
Amounts attributable to common stockholders: |  |  |  |  |
Net income per share: |  |  |  |  |
Basic | $ | 2.92 |  |  | $ | 2.03 |  |  | $ | 2.45 |
Diluted | $ | 2.88 |  |  | $ | 1.99 |  |  | $ | 2.39 |
The computation of diluted earnings per share excludes outstanding stock options in certain periods in which the inclusion of such options would be antidilutive to the periods presented. Total antidilutive options not currently included in the computation of dilutive EPS

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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