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Earning Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Common Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands, except per share data)
Net income | $ | 84,410 |  | $ | 52,646 |  | $ | 59,186
Less: Dividends on preferred stock |  |  |  |  |  |  |  |
Non-convertible preferred stock (Series A, B, and D) |  | (6,511) |  |  | (6,512) |  |  | (6,512)
Convertible preferred stock (Series C) |  | (5,513) |  |  | (7,350) |  |  | (7,350)
Income available to common shareholders | $ | 72,386 |  | $ | 38,784 |  | $ | 45,324
Effect of assumed conversion of the convertible preferred stock |  | 5,513 |  |  | 7,350 |  |  | 7,350
Income available to common shareholders assuming conversion | $ | 77,899 |  | $ | 46,134 |  | $ | 52,674
Weighted average common shares and share equivalents: |  |  |  |  |  |  |  |
Average common shares outstanding |  | 45,400 |  |  | 43,939 |  |  | 43,913
Effect of dilutive securities: |  |  |  |  |  |  |  |
Average potential common shares-options |  | 142 |  |  | 19 |  |  | 37
Average potential common shares-assuming conversion of convertible preferred stock |  | 5,807 |  |  | 7,138 |  |  | 7,138
Total weighted average common shares outstanding and equivalents |  | 51,349 |  |  | 51,096 |  |  | 51,088
Earnings per common share - basic | $ | 1.59 |  | $ | 0.88 |  | $ | 1.03
Earnings per common share - diluted | $ | 1.52 |  | $ | 0.88 |  | $ | 1.03

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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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