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Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Earnings Per Share Calculation [Line Items] |  |  |  |
Net Income, Including Portion Attributable to Noncontrolling Interest | $ 15,570 | $ 13,617 | $ 38,488 | $ 39,803
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Preferred Dividends | (1,218) | (1,218) | (3,656) | (3,656)
Net income to common shareholders | 14,352 | 12,399 | 34,832 | 36,147
Net Income Available to Common Stockholders, Diluted | $ 15,226 | $ 13,263 | $ 37,456 | $ 38,754
Weighted Average Number of Shares Outstanding, Basic | 24,605 | 24,474 | 24,551 | 24,454
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Stock Options | 244 | 214 | 238 | 223
Incremental Common Shares Attributable to Deferred Compensation | 133 | 148 | 147 | 138
Weighted Average Number of Shares Outstanding, Diluted | 30,067 | 29,921 | 30,021 | 29,900
Earnings Per Share, Basic | $ 0.58 | $ 0.51 | $ 1.42 | $ 1.48
Earnings Per Share, Diluted | $ 0.51 | $ 0.44 | $ 1.25 | $ 1.30
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share | 1,460 | 1,286 | 1,443 | 1,243
2017 Convertible Senior Notes [Member] |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Interest on Convertible Debt, Net of Tax | $ 372 | $ 368 | $ 1,117 | $ 1,110
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities | 2,416 | 2,416 | 2,416 | 2,416
2018 Convertible Senior Notes [Member] |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Interest on Convertible Debt, Net of Tax | $ 502 | $ 496 | $ 1,507 | $ 1,497
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities | 2,669 | 2,669 | 2,669 | 2,669

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