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Earnings Per Common Share and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Common Share, Basic and Diluted | The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (Dollars in thousands, except per share data)
Numerator: |  |  |  |  |
Net income available to common stockholders - numerator for earnings per common share | $ | 637,945 |  |  | $ | 246,090 |  |  | $ | 458,016 |
Denominator: |  |  |  |  |
Weighted average common shares outstanding | 92,055,035 |  |  | 91,139,453 |  |  | 90,347,915 |
Effect of dilutive securities: |  |  |  |  |
Stock options and deferred compensation agreements | 93,014 |  |  | 304,196 |  |  | 709,433 |
Restricted stock and restricted stock units | 244,447 |  |  | 338,593 |  |  | 365,237 |
Denominator for earnings per common share - assuming dilution | 92,392,496 |  |  | 91,782,242 |  |  | 91,422,585 |
Earnings per common share | $ | 6.93 |  |  | $ | 2.70 |  |  | $ | 5.07 |
Earnings per common share - assuming dilution | $ | 6.90 |  |  | $ | 2.68 |  |  | $ | 5.01 |

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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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