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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE We apply the two-class method of computing earnings per share, which requires the calculation of separate earnings per share amounts for our non-vested time-based restricted stock awards with non-forfeitable dividends and for our common stock. Our non-vested time-based restricted stock awards with non-forfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. Under the two-class computation method, net losses are not allocated to participating securities unless the holder of the security has a contractual obligation to share in the losses. Our non-vested time-based restricted stock awards with non-forfeitable dividends do not have such an obligation so they are not allocated losses. Below is a summary of the components used to calculate basic and diluted earnings per share (in thousands, except per share):
|  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 37,677 |  |  | $ | 34,083 |  |  | $ | 47,368 |  |  | $ | 67,289 |
Less: Preferred dividends |  | (3,709 | ) |  | (4,200 | ) |  | (9,252 | ) |  | (8,400 | )
Premium on redemption of preferred stock |  | — |  |  | — |  |  | (3,277 | ) |  | — |
Allocation to participating securities |  | (120 | ) |  | (126 | ) |  | (137 | ) |  | (240 | )
Attributable to non-controlling interest |  | (101 | ) |  | (114 | ) |  | (104 | ) |  | (234 | )
Net income attributable to common stockholders, net of amount allocated to participating securities |  | $ | 33,747 |  |  | $ | 29,643 |  |  | $ | 34,598 |  |  | $ | 58,415 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic |  | 103,643 |  |  | 98,184 |  |  | 103,572 |  |  | 95,488 |
Dilutive effect of equity-based compensation awards |  | 240 |  |  | 522 |  |  | 320 |  |  | 495 |
Weighted average common shares outstanding - diluted |  | 103,883 |  |  | 98,706 |  |  | 103,892 |  |  | 95,983 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.33 |  |  | $ | 0.30 |  |  | $ | 0.33 |  |  | $ | 0.61 |
Diluted |  | $ | 0.32 |  |  | $ | 0.30 |  |  | $ | 0.33 |  |  | $ | 0.61 |
All outstanding stock options were included in the computation of diluted earnings per share for the three and six months ended June 30, 2018 and 2017 due to their dilutive effect. The Common Units held by the non-controlling interest holders have been excluded from the denominator of the diluted earnings per share as there would be no effect on the amounts since the limited partners' share of income would also be added to derive net income attributable to common stockholders. We had unvested performance-based restricted stock awards of 453,664 shares and 619,429 shares for the three months ended June 30, 2018 and 2017, respectively, and 453,664 shares and 619,429 shares for the six months ended June 30, 2018 and 2017, respectively, which were excluded from the denominator of the diluted earnings per share as the awards had not achieved the requisite performance conditions for vesting at each period end.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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