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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2018, 2017, and 2016 (in thousands, except per share data):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net income |  | $ | 393,968 |  |  | $ | 182,871 |  |  | $ | 81,520 |
Preferred dividends |  |  | 9,375 |  |  |  | 9,375 |  |  |  | 3,906 |
Net income available to common shareholders |  | $ | 384,593 |  |  | $ | 173,496 |  |  | $ | 77,614 |
Shares for basic and diluted calculation: |  |  |  |  |  |  |  |  |  |  |  |
Average shares used in basic computation |  |  | 71,786 |  |  |  | 68,562 |  |  |  | 66,871 |
Dilutive effect of stock options and units (1) |  |  | 9,535 |  |  |  | 12,473 |  |  |  | 10,692 |
Average shares used in diluted computation |  |  | 81,321 |  |  |  | 81,035 |  |  |  | 77,563 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.36 |  |  | $ | 2.53 |  |  | $ | 1.16 |
Diluted |  | $ | 4.73 |  |  | $ | 2.14 |  |  | $ | 1.00 |
(1) | Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.

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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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