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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
June 30,
 
March 31,
 
June 30,
 
June 30,
 
2018
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings
$
115,735

 
$
118,276

 
$
93,647

 
$
234,011

 
$
172,315

Less: Earnings allocated to unvested restricted stock(1)
(1,348
)
 
(1,115
)
 
(1,080
)
 
(2,469
)
 
(2,082
)
Net earnings allocated to common shares
$
114,387

 
$
117,161

 
$
92,567

 
$
231,542

 
$
170,233

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares and unvested restricted
 
 
 
 
 
 
 
 
 
stock outstanding
126,082

 
127,487

 
121,422

 
126,780

 
121,384

Less: Weighted-average unvested restricted stock
 
 
 
 
 
 
 
 
 
outstanding
(1,466
)
 
(1,413
)
 
(1,455
)
 
(1,439
)
 
(1,479
)
Weighted-average basic shares outstanding
124,616

 
126,074

 
119,967

 
125,341

 
119,905

 
 
 
 
 
 
 
 
 
 
Basic earnings per share
$
0.92

 
$
0.93

 
$
0.77

 
$
1.85

 
$
1.42

 
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings allocated to common shares
$
114,387

 
$
117,161

 
$
92,567

 
$
231,542

 
$
170,233

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares outstanding
124,616

 
126,074

 
119,967

 
125,341

 
119,905

 
 
 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.92

 
$
0.93

 
$
0.77

 
$
1.85

 
$
1.42


________________________
(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.