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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method
The table below presents the computation of basic and diluted net income per share of common stock for the years ended December 31, 2019, 2018, and 2017 ($ in thousands except per share data): 
 
For the year ended
 
2019
 
2018
 
2017
Basic Earnings
 
 
 
 
 
Net income
$
230,174

 
$
219,986

 
$
193,031

Less: Preferred dividends
(18,525
)
 
(27,340
)
 
(36,761
)
Net income available to common stockholders
$
211,649

 
$
192,646

 
$
156,270

Less: Dividends on participating securities
(3,867
)
 
(3,405
)
 
(2,913
)
      Basic Earnings
$
207,782

 
$
189,241

 
$
153,357


 
 
 
 
 
Diluted Earnings
 
 
 
 
 
Net income
$
230,174

 
$
219,986

 
$
193,031

Less: Preferred dividends
(18,525
)
 
(27,340
)
 
(36,761
)
Net income available to common stockholders
$
211,649

 
$
192,646

 
$
156,270

 
 
 
 
 
 
Add: Interest expense on Notes
35,173

 
34,779

 
N/A

      Diluted Earnings
$
246,822

 
$
227,425

 
$
156,270


 
 
 
 
 
Number of Shares:
 
 
 
 
 
Basic weighted-average shares of common stock outstanding
146,881,231

 
124,147,073

 
99,859,153

Diluted weighted-average shares of common stock outstanding
175,794,896

 
153,821,515

 
101,232,610


 
 
 
 
 
Earnings Per Share Attributable to common stockholders
 
 
 
 
 
Basic
$
1.41

 
$
1.52

 
$
1.54

Diluted
$
1.40

 
$
1.48

 
$
1.54