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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Net income per share
The following table presents the computations of basic and diluted net earnings per share for the periods indicated:
 
Three Months Ended
 
March 31,
 
December 31,
 
March 31,
 
2018
 
2017
 
2017
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
Net earnings
$
118,276

 
$
84,037

 
$
78,668

Less: Earnings allocated to unvested restricted stock(1)
(1,115
)
 
(951
)
 
(999
)
Net earnings allocated to common shares
$
117,161

 
$
83,086

 
$
77,669

 
 
 
 
 
 
Weighted-average basic shares and unvested restricted
 
 
 
 
 
stock outstanding
127,487

 
127,971

 
121,346

Less: Weighted-average unvested restricted stock
 
 
 
 
 
outstanding
(1,413
)
 
(1,440
)
 
(1,503
)
Weighted-average basic shares outstanding
126,074

 
126,531

 
119,843

 
 
 
 
 
 
Basic earnings per share
$
0.93

 
$
0.66

 
$
0.65

 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
Net earnings allocated to common shares
$
117,161

 
$
83,086

 
$
77,669

 
 
 
 
 
 
Weighted-average basic shares outstanding
126,074

 
126,531

 
119,843

 
 
 
 
 
 
Diluted earnings per share
$
0.93

 
$
0.66

 
$
0.65


________________________
(1)
Represents cash dividends paid to holders of unvested restricted stock, net of forfeitures, plus undistributed earnings amounts available to holders of unvested restricted stock, if any.