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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2017
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.
 
All outstanding stock options were included in the computation of diluted earnings per share for the years ended December 31, 2017, 2016 and 2015 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. For the years ended December 31, 2017, 2016, and 2015, we had unvested performance-based restricted stock awards of 464,924 shares, 409,068 shares and 194,463 shares, 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.
 
Below is a summary of the components used to calculate basic and diluted earnings per share (in thousands, except per share amounts):
 
 
 
2017
 
2016
 
2015
Numerator:
 
 

 
 

 
 

Income from continuing operations
 
$
99,521

 
$
108,261

 
$
125,256

Less: Preferred dividends
 
(17,408
)
 
(18,232
)
 
(16,588
)
Premium on redemption of preferred stock
 
(2,572
)
 
(2,125
)
 
—

Allocation to participating securities
 
(307
)
 
(342
)
 
(118
)
Attributable to non-controlling interest
 
(307
)
 
(456
)
 
(819
)
Net income attributable to common stockholders, net of amount allocated to participating securities
 
$
78,927

 
$
87,106

 
$
107,731

 
 
 
 
 
 
 
Denominator:
 
 

 
 

 
 

Weighted average common shares outstanding - basic
 
99,406

 
86,874

 
85,920

Dilutive effect of equity-based compensation awards
 
374

 
469

 
1,224

Weighted average common shares outstanding - diluted
 
99,780

 
87,343

 
87,144

 
 
 
 
 
 
 
Earnings per share:
 
 

 
 

 
 

Basic
 
$
0.79

 
$
1.00

 
$
1.25

Diluted
 
$
0.79

 
$
1.00

 
$
1.24