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Earnings Per Share and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 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:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (Dollars in thousands, except per share data)
Numerator: |  |  |  |  |
Net income - numerator for earnings per common share | $ | 458,016 |  |  | $ | 174,645 |  |  | $ | 83,243 |
Denominator: |  |  |  |  |
Weighted average common shares outstanding | 90,347,915 |  |  | 88,982,442 |  |  | 84,793,151 |
Effect of dilutive securities: |  |  |  |  |
Warrants | — |  |  | — |  |  | 15,136 |
Stock options and deferred compensation agreements | 709,433 |  |  | 945,612 |  |  | 456,236 |
Restricted stock and restricted stock units | 365,237 |  |  | 382,954 |  |  | 340,646 |
Denominator for earnings per common share - assuming dilution | 91,422,585 |  |  | 90,311,008 |  |  | 85,605,169 |
Earnings per common share | $ | 5.07 |  |  | $ | 1.96 |  |  | $ | 0.98 |
Earnings per common share - assuming dilution | $ | 5.01 |  |  | $ | 1.93 |  |  | $ | 0.97 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | Options to purchase shares of our common stock that were outstanding during the respective periods indicated but were not included in the computation of diluted earnings per share because the options' exercise price was greater than the average market price of the common shares are as follows:
Period |  | Number of Shares |  | Range of Exercise Prices
|  |  |  | Minimum |  | Maximum
Year ended December 31, 2018 |  | — |  | $— |  | $—
Year ended December 31, 2017 |  | — |  | $— |  | $—
Year ended December 31, 2016 |  | 1,054,091 |  | $24.79 |  | $24.79

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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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