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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share amounts)
Amounts attributable to common stockholders: |  |  |  |  |  |  |
Net income: |  |  |  |  |  |  |
Net income — basic | $ | 68,935 |  |  | $ | 56,164 |  |  | $ | 254,162 |  |  | $ | 299,347 |
After tax interest on convertible debt | 15 |  |  | 13 |  |  | 45 |  |  | 38 |
Net income — diluted | $ | 68,950 |  |  | $ | 56,177 |  |  | $ | 254,207 |  |  | $ | 299,385 |
Weighted average shares (denominator): |  |  |  |  |  |  |
Weighted average shares — basic | 180,858 |  |  | 187,435 |  |  | 182,859 |  |  | 187,761 |
Stock options | 4,284 |  |  | 4,575 |  |  | 4,364 |  |  | 4,448 |
Restricted stock units | 197 |  |  | 112 |  |  | 173 |  |  | 87 |
Convertible debt | 121 |  |  | 121 |  |  | 121 |  |  | 121 |
Weighted average shares — diluted | 185,460 |  |  | 192,243 |  |  | 187,517 |  |  | 192,417 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.38 |  |  | $ | 0.30 |  |  | $ | 1.39 |  |  | $ | 1.59 |
Diluted | $ | 0.37 |  |  | $ | 0.29 |  |  | $ | 1.36 |  |  | $ | 1.56 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands) |  | (In thousands)
Anti-dilutive options | 831 |  |  | — |  |  | 980 |  |  | 878 |

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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=6371337&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://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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