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Earnings Per Share (Basic and Diluted Earnings (Loss) Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,178 |  | $ 49,791 |  | $ 26,540
Impact of assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 1,959 |  | 0
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 141
Net income attributable to common stockholders - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,178 |  | $ 51,750 |  | $ 26,681
Weighted average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,346 |  | 48,185 |  | 44,229
Assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental common shares from warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,355 |  | 1,560 |  | 2,222
Incremental common shares from stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,133 |  | 992 |  | 747
Incremental common shares from convertible preferred stock before conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 440
Incremental common shares from restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  | 116 |  | 0
Incremental common shares from convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 2,701 |  | 0
Weighted average common shares outstanding - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,841 |  | 53,554 |  | 47,638
Basic earnings per common share | $ 0.21 | [1] | $ 0.17 | [1] | $ 0.17 | [1] | $ 0.16 | [1] | $ 0.48 | [1] | $ 0.20 | [1] | $ 0.27 | [1] | $ 0.08 | [1] | $ 0.70 | [1] | $ 1.03 | [1] | $ 0.60
Diluted earnings per common share | $ 0.20 | [1] | $ 0.16 | [1] | $ 0.16 | [1] | $ 0.15 | [1] | $ 0.44 | [1] | $ 0.19 | [1] | $ 0.25 | [1] | $ 0.07 | [1] | $ 0.67 | [1] | $ 0.97 | [1] | $ 0.56
[1] | The sum of the quarterly earnings per share (basic and diluted) may not agree to the earnings per share for the year due to the timing of common stock issuances.

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