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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Income Per Share
The following table presents the computation of basic and diluted net earnings per share for the years indicated:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
Net earnings
$
468,636

 
$
465,339

 
$
357,818

Less: earnings allocated to unvested restricted stock(1)
(5,182
)
 
(5,119
)
 
(4,184
)
Net earnings allocated to common shares
$
463,454

 
$
460,220

 
$
353,634

 
 
 
 
 
 
Weighted-average basic shares and unvested restricted stock outstanding
120,468

 
125,100

 
123,060

Less: weighted-average unvested restricted stock outstanding
(1,502
)
 
(1,460
)
 
(1,447
)
Weighted-average basic shares outstanding
118,966

 
123,640

 
121,613

 
 
 
 
 
 
Basic earnings per share
$
3.90

 
$
3.72

 
$
2.91

 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
Net earnings allocated to common shares
$
463,454

 
$
460,220

 
$
353,634

 
 
 
 
 
 
Weighted-average diluted shares outstanding
118,966

 
123,640

 
121,613

 
 
 
 
 
 
Diluted earnings per share
$
3.90

 
$
3.72

 
$
2.91

________________________
(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.