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Earnings per Share Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Earnings Per Share Calculation [Line Items] |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | $ 13,617 | $ 125,311 | $ 39,803 | $ 137,162
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Preferred Dividends | (1,218) | (1,219) | (3,656) | (2,438)
Preferred Stock Redemption Premium | 0 | 0 | 0 | (2,190)
Net income to common shareholders | 12,399 | 124,092 | 36,147 | 132,534
Net Income (Loss) Available to Common Stockholders, Diluted | 13,263 | 125,527 | 38,754 | 136,218
Weighted Average Number of Shares Outstanding, Basic | 24,474 | 24,358 | 24,454 | 23,642
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Stock Options | 214 | 183 | 223 | 246
Incremental Common Shares Attributable to Deferred Compensation | 148 | 119 | 138 | 111
Weighted Average Number of Shares Outstanding, Diluted | 29,921 | 29,745 | 29,900 | 28,410
Earnings Per Share, Basic | $ 0.51 | $ 5.09 | $ 1.48 | $ 5.61
Earnings Per Share, Diluted | $ 0.44 | $ 4.22 | $ 1.30 | $ 4.79
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share | 1,286 | 998 | 1,243 | 951
2017 Convertible Senior Notes [Member] |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |
Interest on Convertible Debt, Net of Tax | 368 | 611 | 1,110 | 1,833
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 | $ 496 | $ 824 | $ 1,497 | $ 1,851
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities | 2,669 | 2,669 | 2,669 | 1,995

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