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Earnings Per Share Level 3 (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | A reconciliation of the numerators and denominators of basic and diluted EPS is presented below:
| Three months ended June 30, | Six months ended June 30, |
| 2021 |  | 2020 | 2021 |  | 2020 |  |  |  |  |
| (In thousands, except per share amounts) |  |  |  |  |
Amounts attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Net income — basic and diluted | $ | 157,705 |  |  | $ | 105,508 |  | $ | 386,584 |  |  | $ | 187,449 |  |  |  |  |  |
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares — basic | 168,450 |  |  | 177,902 |  | 169,180 |  |  | 179,378 |  |  |  |  |  |
Stock options | 2,363 |  |  | 1,740 |  | 2,382 |  |  | 2,221 |  |  |  |  |  |
Restricted share units | 50 |  |  | 24 |  | 54 |  |  | 40 |  |  |  |  |  |
Weighted average shares — diluted | 170,863 |  | 179,666 | 171,616 |  | 181,639 |  |  |  |  |
Amounts attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.94 |  |  | $ | 0.59 |  | $ | 2.29 |  |  | $ | 1.04 |  |  |  |  |  |
Diluted | $ | 0.92 |  |  | $ | 0.59 |  | $ | 2.25 |  |  | $ | 1.03 |  |  |  |  |  |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
| Three months ended June 30, | Six months ended June 30, |  |
| 2021 |  | 2020 | 2021 |  | 2020 |  |  |  |  |  |
| (In thousands) |  |  |  |  |  |
Antidilutive options | 1,612 |  |  | 2,706 |  | 1,445 |  |  | 1,486 |  |  |  |  |  |  |
Antidilutive restricted share units | — |  |  | 67 |  | — |  |  | 49 |  |  |  |  |  |  |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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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=124432515&loc=d3e3550-109257 + Details
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