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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations for Net Income (Detail) (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
Numerator for EPS: |  |  |  |
Net income | $ 21,341 | $ 14,407 | $ 52,016 | $ 43,395
Less: Preferred stock dividends | (3) | (14) | (11) | (24)
Income available to common stockholders | $ 21,338 | $ 14,393 | $ 52,005 | $ 43,371
Denominator for EPS: |  |  |  |
Weighted average common shares outstanding | 33,432 | 33,658 | 33,607 | 36,628
Plus: Assumed conversion of stock-based compensation | 1,345 | 1,630 | 1,440 | 1,291
Plus: Assumed conversion of preferred stock | 35 | 323 | 50 | 433
Weighted average diluted common shares outstanding | 34,812 | 35,611 | 35,097 | 38,352
Basic earnings per common share | $ 0.64 | $ 0.43 | $ 1.55 | $ 1.18
Diluted earnings per common share | $ 0.61 | $ 0.40 | $ 1.48 | $ 1.13

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