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Earnings Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Basic Earnings per Common Share |  |
Net income attributable to Company | $ 29,618 | $ 19,182
Less: Preferred stock dividends | (5,925) | (3,225)
NET INCOME ATTRIBUTABLE TO COMPANY'S COMMON STOCKHOLDERS | $ 23,693 | $ 15,957
Weighted average common shares outstanding-basic (in shares) | 112,018 | 111,721
Basic Earnings per Common Share (in dollars per share) | $ 0.21 | $ 0.14
Diluted Earnings per Common Share: |  |
Net income attributable to Company | $ 29,618 | $ 19,182
Less: Preferred stock dividends | (5,925) | (3,225)
Add back: Interest expense on convertible notes for the period, net of tax | 2,634 | 1,960
Net income attributable to Company's common stockholders | $ 26,327 | $ 17,917
Weighted average common shares outstanding-basic (in shares) | 112,018 | 111,721
Net effect of assumed PSUs vested (in shares) | 49 | 0
Net effect of assumed convertible notes conversion to common shares (in shares) | 19,694 | 14,881
Diluted weighted average common shares outstanding (in shares) | 131,761 | 126,602
Diluted Earnings per Common Share (in dollars per share) | $ 0.20 | $ 0.14

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