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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
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: 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In thousands, except per share data)
 
2019
 
2018
 
2019
 
2018
Net income
 
$
69,594

 
$
68,988

 
$
132,536

 
$
140,584

  Net income allocated to participating securities
 
—

 
40

 
24

 
105

Net income allocated to common shareholders (1)
 
$
69,594

 
$
68,948

 
$
132,512

 
$
140,479

Weighted average common shares - issued
 
71,554

 
71,371

 
71,526

 
71,334

  Average unvested restricted share awards
 
—

 
(42
)
 
(12
)
 
(54
)
Weighted average common shares outstanding - basic
 
71,554

 
71,329

 
71,514

 
71,280

Effect of dilutive securities
 
 
 
 
 
 
 
 
  Weighted average common stock equivalents
 
718

 
697

 
693

 
686

Weighted average common shares outstanding - diluted
 
72,272

 
72,026

 
72,207

 
71,966

EPS available to common shareholders
 
 
 
 
 
 
 
 
  Basic earnings per common share
 
$
0.97

 
$
0.97

 
$
1.85

 
$
1.97

  Diluted earnings per common share
 
$
0.96

 
$
0.96

 
$
1.84

 
$
1.95


(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 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.