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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands, except share and per share data)
Numerator: |  |  |  |  |  |  |
Net income - numerator for earnings per common share | $ | 93,903 |  |  | $ | 26,946 |  |  | $ | 234,865 |  |  | $ | 80,885 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 90,326,747 |  |  | 88,897,203 |  |  | 90,172,812 |  |  | 88,772,831 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options and deferred compensation agreements | 696,007 |  |  | 850,870 |  |  | 773,149 |  |  | 899,594 |
Restricted stock and restricted stock units | 248,094 |  |  | 364,211 |  |  | 259,992 |  |  | 372,214 |
Denominator for earnings per common share - assuming dilution | 91,270,848 |  |  | 90,112,284 |  |  | 91,205,953 |  |  | 90,044,639 |
Earnings per common share | $ | 1.04 |  |  | $ | 0.30 |  |  | $ | 2.60 |  |  | $ | 0.91 |
Earnings per common share - assuming dilution | $ | 1.03 |  |  | $ | 0.30 |  |  | $ | 2.58 |  |  | $ | 0.90 |

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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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