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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Numerator and denominator of the basic and diluted earnings per common share computations
The factors used in the earnings per share computation follow: 
 
 
For the years ended December 31,
(In thousands, except per share data)
 
2017
 
2016
 
2015
Net income
 
$
149,523

 
$
108,032

 
$
86,830

  Net income allocated to participating securities
 
495

 
166

 
—

Net income allocated to common shareholders(1)
 
$
149,028

 
$
107,866

 
$
86,830

Weighted average common shares - issued
 
71,103

 
49,091

 
36,081

  Average unvested restricted share awards
 
(238
)
 
(139
)
 
—

Weighted average common shares outstanding - basic
 
70,865

 
48,952

 
36,081

Effect of dilutive securities
 
 
 
 
 
 
  Weighted average common stock equivalents
 
648

 
651

 
272

Weighted average common shares outstanding - diluted
 
71,513

 
49,603

 
36,353

EPS available to common shareholders
 
 
 
 
 
 
  Basic earnings per common share
 
$
2.11

 
$
2.21

 
$
2.41

  Diluted earnings per common share
 
$
2.08

 
$
2.17

 
$
2.39


(1) 
Net income allocated to common shareholders for basic and diluted earnings per share may differ under the two-class method as a result of adding common share equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate net income to common shareholders and participating securities for the purposes of calculating diluted earnings per share.