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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
 
Twelve Months Ended December 31,
 
 
2017
 
2016
 
2015
Basic Earnings per Common Share
 
 
 
 
 
 
Net income attributable to Company
 
$
91,980

 
$
67,551

 
$
78,013

Less: Preferred stock dividends
 
(15,660
)
 
(12,900
)
 
(10,990
)
Net income attributable to Company's common stockholders
 
$
76,320

 
$
54,651

 
$
67,023

Basic weighted average common shares outstanding
 
111,836

 
109,594

 
108,399

Basic Earnings per Common Share
 
$
0.68

 
$
0.50

 
$
0.62

 
 
 
 
 
 
 
Diluted Earnings per Common Share:
 
 
 
 
 
 
Net income attributable to Company
 
$
91,980

 
$
67,551

 
$
78,013

Less: Preferred stock dividends
 
(15,660
)
 
(12,900
)
 
(10,990
)
Add back: Interest expense on convertible notes for the period, net of tax
 
9,158

 
—

 
—

Net income attributable to Company's common stockholders
 
$
85,478

 
$
54,651

 
$
67,023

Weighted average common shares outstanding
 
111,836

 
109,594

 
108,399

Net effect of assumed convertible notes conversion to common shares
 
18,507

 
—

 
—

Diluted weighted average common shares outstanding
 
130,343

 
109,594

 
108,399

Diluted Earnings per Common Share
 
$
0.66

 
$
0.50

 
$
0.62