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Earnings per Share Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Loss per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The table below presents a reconciliation between basic and diluted weighted average shares outstanding, net income available to common shareholders and basic and diluted income per share for the years ended December 31, 2016, 2015 and 2014:
| Year Ended December 31,
(In thousands, except per share amounts) | 2016 |  | 2015 |  | 2014
NUMERATOR |  |  |  |  |
Net income | $ | 56,609 |  |  | $ | 51,763 |  |  | $ | 50,789 |
Preferred stock dividends | (4,875 | ) |  | (4,875 | ) |  | (4,875 | )
Net income available to common shareholders | 51,734 |  |  | 46,888 |  |  | 45,914 |
Interest on 3.25% convertible senior subordinated notes due 2017 | 1,520 |  |  | 1,499 |  |  | 1,504 |
Interest on 3.00% convertible senior subordinated notes due 2018 | 2,050 |  |  | 2,021 |  |  | 2,030 |
Diluted income available to common shareholders | $ | 55,304 |  |  | $ | 50,408 |  |  | $ | 49,448 |
DENOMINATOR |  |  |  |  |
Basic weighted average shares outstanding | 24,666 |  |  | 24,575 |  |  | 24,463 |
Effect of dilutive securities: |  |  |  |  |
Stock option awards | 216 |  |  | 237 |  |  | 222 |
Deferred compensation awards | 149 |  |  | 150 |  |  | 142 |
3.25% convertible senior subordinated notes due 2017 | 2,416 |  |  | 2,416 |  |  | 2,416 |
3.00% convertible senior subordinated notes due 2018 | 2,669 |  |  | 2,669 |  |  | 2,669 |
Diluted weighted average shares outstanding - adjusted for assumed conversions | 30,116 |  |  | 30,047 |  |  | 29,912 |
Earnings per common share |  |  |  |  |
Basic | $ | 2.10 |  |  | $ | 1.91 |  |  | $ | 1.88 |
Diluted | $ | 1.84 |  |  | $ | 1.68 |  |  | $ | 1.65 |
Anti-dilutive equity awards not included in the calculation of diluted earnings per common share | 1,273 |  |  | 1,447 |  |  | 1,250 |

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- Definition Loss per Share [Abstract] + References No definition available. + 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://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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