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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Dilutive Net Income Per Share
The following table presents the computation of basic and diluted earnings per common share for the periods indicated (dollar and share amounts in thousands, except per share amounts):
 
 
Three Months Ended March 31,
 
 
2018
 
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

Basic weighted average common shares outstanding
 
112,018

 
111,721

Basic Earnings per Common 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
 
112,018

 
111,721

Net effect of assumed PSUs vested
 
49

 
—

Net effect of assumed convertible notes conversion to common shares
 
19,694

 
14,881

Diluted weighted average common shares outstanding
 
131,761

 
126,602

Diluted Earnings per Common Share
 
$
0.20

 
$
0.14