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Earnings per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
NOTE 15.  EARNINGS PER SHARE
The following table presents the computation of basic and diluted net earnings per share for the years indicated:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
Net earnings
$
465,339

 
$
357,818

 
$
352,166

Less: earnings allocated to unvested restricted stock(1)
(5,119
)
 
(4,184
)
 
(3,988
)
Net earnings allocated to common shares
$
460,220

 
$
353,634

 
$
348,178

 
 
 
 
 
 
Weighted-average basic shares and unvested restricted stock outstanding
125,100

 
123,060

 
121,670

Less: weighted-average unvested restricted stock outstanding
(1,460
)
 
(1,447
)
 
(1,431
)
Weighted-average basic shares outstanding
123,640

 
121,613

 
120,239

 
 
 
 
 
 
Basic earnings per share
$
3.72

 
$
2.91

 
$
2.90

 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
Net earnings allocated to common shares
$
460,220

 
$
353,634

 
$
348,178

 
 
 
 
 
 
Weighted-average basic shares outstanding
123,640

 
121,613

 
120,239

 
 
 
 
 
 
Diluted earnings per share
$
3.72

 
$
2.91

 
$
2.90

________________________
(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.