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Earnings and Dividends Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table summarizes the average number of common shares and the net income used in the calculation of basic and diluted earnings per common share (in thousands, except share and per share amounts):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Net income attributable to common stockholders
$
154,333

 
$
159,365

 
$
151,540

 
 
 
 
 
 
BASIC:
 
 
 
 
 
Weighted average common shares outstanding
41,943,873

 
40,894,219

 
39,013,412

 
 
 
 
 
 
DILUTED:
 
 
 
 
 
Weighted average common shares outstanding
41,943,873

 
40,894,219

 
39,013,412

Stock options and restricted shares
67,735

 
67,703

 
52,497

Convertible senior notes - unsecured
80,123

 
189,531

 
89,471

Average dilutive common shares outstanding
42,091,731

 
41,151,453

 
39,155,380

 
 
 
 
 
 
Net income per common share - basic
$
3.68

 
$
3.90

 
$
3.88

Net income per common share - diluted
$
3.67

 
$
3.87

 
$
3.87

 
 
 
 
 
 
Net share effect of anti-dilutive stock options
518

 
573

 
6,366

 
 
 
 
 
 
Regular dividends declared per common share
$
4.00

 
$
3.80

 
$
3.60