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Net Income (Loss) per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016 ($ in thousands except per share data): 
 
For the year ended
 
2018
 
2017
 
2016
Basic Earnings
 
 
 
 
 
Net income
$
219,986

 
$
193,031

 
$
157,876

Less: Preferred dividends
(27,340
)
 
(36,761
)
 
(30,295
)
Net income available to common stockholders
$
192,646

 
$
156,270

 
$
127,581

Less: Dividends on participating securities
(3,405
)
 
(2,913
)
 
(2,087
)
      Basic Earnings
$
189,241

 
$
153,357

 
$
125,494


 
 
 
 
 
Diluted Earnings
 
 
 
 
 
Net income
$
219,986

 
$
193,031

 
$
157,876

Less: Preferred dividends
(27,340
)
 
(36,761
)
 
(30,295
)
Net income available to common stockholders
$
192,646

 
$
156,270

 
$
127,581

Add: Interest expense on Notes
34,779

 
N/A

 
N/A

      Diluted Earnings
$
227,425

 
$
156,270

 
$
127,581


 
 
 
 
 
Number of Shares:
 
 
 
 
 
Basic weighted-average shares of common stock outstanding
124,147,073

 
99,859,153

 
72,371,374

Diluted weighted-average shares of common stock outstanding
153,821,515

 
101,232,610

 
73,305,101


 
 
 
 
 
Earnings Per Share Attributable to common stockholders
 
 
 
 
 
Basic
$
1.52

 
$
1.54

 
$
1.74

Diluted
$
1.48

 
$
1.54

 
$
1.74