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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
Nine Months Ended September 30,
(In thousands, except per share data)
 
2018
 
2017
 
2018
 
2017
Net income
 
$
70,397

 
$
40,459

 
$
210,981

 
$
140,077

  Net income allocated to participating securities
 
40

 
129

 
144

 
566

Net income allocated to common shareholders (1)
 
$
70,357

 
$
40,330

 
$
210,837

 
$
139,511

Weighted average common shares - issued
 
71,426

 
71,139

 
71,365

 
71,077

  Average unvested restricted share awards
 
(41
)
 
(228
)
 
(49
)
 
(290
)
Weighted average common shares outstanding - basic
 
71,385

 
70,911

 
71,316

 
70,787

Effect of dilutive securities
 
 
 
 
 
 
 
 
  Weighted average common stock equivalents
 
702

 
594

 
691

 
667

Weighted average common shares outstanding - diluted
 
72,087

 
71,505

 
72,007

 
71,454

EPS available to common shareholders
 
 
 
 
 
 
 
 
  Basic earnings per common share
 
$
0.99

 
$
0.57

 
$
2.96

 
$
1.98

  Diluted earnings per common share
 
$
0.98

 
$
0.56

 
$
2.93

 
$
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.