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Earnings per Share Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Earnings Per Share Calculation [Line Items] |  |  |  |
Net Income, Including Portion Attributable to Noncontrolling Interest | $ 13,350 | $ 13,554 | $ 22,918 | $ 26,186
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Preferred Dividends | (1,219) | (1,219) | (2,438) | (2,438)
Net income to common shareholders | 12,131 | 12,335 | 20,480 | 23,748
Net Income Available to Common Stockholders, Diluted | $ 13,006 | $ 13,235 | $ 22,230 | $ 25,494
Weighted Average Number of Shares Outstanding, Basic | 24,531 | 24,470 | 24,523 | 24,444
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Stock Options | 243 | 218 | 233 | 228
Incremental Common Shares Attributable to Deferred Compensation | 164 | 140 | 161 | 134
Weighted Average Number of Shares Outstanding, Diluted | 30,023 | 29,913 | 30,002 | 29,891
Earnings Per Share, Basic | $ 0.49 | $ 0.50 | $ 0.84 | $ 0.97
Earnings Per Share, Diluted | $ 0.43 | $ 0.44 | $ 0.74 | $ 0.85
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share | 1,486 | 1,287 | 1,428 | 1,221
2017 Convertible Senior Notes [Member] |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Interest on Convertible Debt, Net of Tax | $ 373 | $ 383 | $ 745 | $ 744
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 | $ 517 | $ 1,005 | $ 1,002
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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