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Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic: |  |  |  |
Net income | $ 171,416 | $ 171,302 | $ 485,820 | $ 530,683
Basic weighted-average number of shares outstanding (in shares) | 145,559 | 144,921 | 145,455 | 144,829
Basic EPS (in dollars per share) | $ 1.18 | $ 1.18 | $ 3.34 | $ 3.66
Diluted: |  |  |  |
Net income | $ 171,416 | $ 171,302 | $ 485,820 | $ 530,683
Basic weighted-average number of shares outstanding (in shares) | 145,559 | 144,921 | 145,455 | 144,829
Diluted potential common shares (in shares) | 561 | 1,252 | 633 | 1,329
Diluted weighted-average number of shares outstanding (in shares) | 146,120 | 146,173 | 146,088 | 146,158
Diluted EPS (in dollars per share) | $ 1.17 | $ 1.17 | $ 3.33 | $ 3.63

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