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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands, except per share data)
 
2017
 
2016
 
2017
 
2016
Net income
 
$
40,459

 
$
11,484

 
$
140,077

 
$
60,864

  Net income allocated to participating securities
 
129

 
37

 
566

 
78

Net income allocated to common shareholders (1)
 
$
40,330

 
$
11,447

 
$
139,511

 
$
60,786

Weighted average common shares - issued
 
71,139

 
49,109

 
71,077

 
41,881

  Average unvested restricted share awards
 
(228
)
 
(159
)
 
(290
)
 
(53
)
Weighted average common shares outstanding - basic
 
70,911

 
48,950

 
70,787

 
41,828

Effect of dilutive securities
 
 
 
 
 
 
 
 
  Weighted average common stock equivalents
 
594

 
687

 
667

 
493

Weighted average common shares outstanding - diluted
 
71,505

 
49,637

 
71,454

 
42,321

EPS available to common shareholders
 
 
 
 
 
 
 
 
  Basic earnings per common share
 
$
0.57

 
$
0.23

 
$
1.98

 
$
1.45

  Diluted earnings per common share
 
$
0.56

 
$
0.23

 
$
1.95

 
$
1.42


 
(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.