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Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables) | 3 Months Ended
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Mar. 31, 2019
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following chart sets forth the computation of earnings per share (in thousands, except per share amounts):
| Three Months Ended
| March 31,
| 2019 |  | 2018
Net income | $ | 99,063 |  |  | $ | 152,763 |
Denominator for basic earnings per share—Weighted-average shares outstanding | 315,046 |  |  | 309,517 |
Effect of dilutive securities: |  |  |
RSUs | 414 |  |  | 619 |
PSUs | — |  |  | — |
Stock options | 558 |  |  | 1,211 |
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding | 316,018 |  |  | 311,347 |
Earnings per share, basic | $ | 0.31 |  |  | $ | 0.49 |
Earnings per share, diluted | $ | 0.31 |  |  | $ | 0.49 |

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- Definition [Line Items] for Schedule of Earnings Per Share, Basic and Diluted [Table] - 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 No definition available. + 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/2003/role/presentationRef -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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