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Earning Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculation of earnings per common share for the quarters and nine-month periods ended September 3 0, 201 4 and 201 3 is as follows:
| Quarter ended September 30 , |  | Nine-Month Period Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
| (In thousands, except per share data)
Net income | $ | 19,532 |  | $ | 19,621 |  | $ | 64,588 |  | $ | 78,352
Less: Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |
Non-convertible preferred stock (Series A, B, and D) |  | (1,627) |  |  | (1,628) |  |  | (4,882) |  |  | (4,884)
Convertible preferred stock (Series C) |  | (1,838) |  |  | (1,837) |  |  | (5,514) |  |  | (5,512)
Income available to common shareholders | $ | 16,067 |  | $ | 16,156 |  | $ | 54,192 |  | $ | 67,956
Effect of assumed conversion of the convertible ' ' preferred stock |  | 1,838 |  |  | 1,837 |  |  | 5,514 |  |  | 5,512
Income available to common shareholders assuming conversion | $ | 17,905 |  | $ | 17,993 |  | $ | 59,706 |  | $ | 73,468
Weighted average common shares and share equivalents: |  |  |  |  |  |  |  |  |  |  |
Average common shares outstanding |  | 45,055 |  |  | 45,927 |  |  | 45,131 |  |  | 45,717
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Average potential common shares-options |  | 160 |  |  | 257 |  |  | 162 |  |  | 198
Average potential common shares-assuming ' ' conversion of convertible preferred stock |  | 7,147 |  |  | 7,138 |  |  | 7,147 |  |  | 7,138
Total weighted average common shares ' 'outstanding and equivalents |  | 52,362 |  |  | 53,322 |  |  | 52,440 |  |  | 53,053
Earnings per common share - basic | $ | 0.36 |  | $ | 0.35 |  | $ | 1.20 |  | $ | 1.49
Earnings per common share - diluted | $ | 0.34 |  | $ | 0.34 |  | $ | 1.14 |  | $ | 1.39

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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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