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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per Share Calculation [Line Items] |  |  |  |
Net Income, Including Portion Attributable to Noncontrolling Interest | $ 15,916 | $ 13,350 | $ 25,105 | $ 22,918
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Preferred Dividends | (1,219) | (1,219) | (2,438) | (2,438)
Net income to common shareholders | 14,697 | 12,131 | 22,667 | 20,480
Net Income Available to Common Stockholders, Diluted | $ 15,613 | $ 13,006 | $ 24,484 | $ 22,230
Weighted Average Number of Shares Outstanding, Basic | 24,669 | 24,531 | 24,663 | 24,523
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Stock Options | 185 | 243 | 177 | 233
Incremental Common Shares Attributable to Deferred Compensation | 138 | 164 | 130 | 161
Weighted Average Number of Shares Outstanding, Diluted | 30,077 | 30,023 | 30,055 | 30,002
Earnings Per Share, Basic | $ 0.60 | $ 0.49 | $ 0.92 | $ 0.84
Earnings Per Share, Diluted | $ 0.52 | $ 0.43 | $ 0.81 | $ 0.74
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share | 1,261 | 1,486 | 1,301 | 1,428
2017 Convertible Senior Notes [Member] |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Interest on Convertible Debt, Net of Tax | $ 390 | $ 373 | $ 774 | $ 745
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 | $ 526 | $ 502 | $ 1,043 | $ 1,005
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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