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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
Nine Months Ended
 
September 30,
 
June 30,
 
September 30,
 
September 30,
 
2017
 
2017
 
2016
 
2017
 
2016
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings
$
101,466

 
$
93,647

 
$
93,895

 
$
273,781

 
$
266,519

Less: Earnings allocated to unvested restricted stock(1)
(1,149
)
 
(1,080
)
 
(1,048
)
 
(3,239
)
 
(2,983
)
Net earnings allocated to common shares
$
100,317

 
$
92,567

 
$
92,847

 
$
270,542

 
$
263,536

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares and unvested restricted
 
 
 
 
 
 
 
 
 
stock outstanding
121,447

 
121,422

 
121,818

 
121,405

 
121,739

Less: Weighted-average unvested restricted stock
 
 
 
 
 
 
 
 
 
outstanding
(1,394
)
 
(1,455
)
 
(1,401
)
 
(1,450
)
 
(1,425
)
Weighted-average basic shares outstanding
120,053

 
119,967

 
120,417

 
119,955

 
120,314

 
 
 
 
 
 
 
 
 
 
Basic earnings per share
$
0.84

 
$
0.77

 
$
0.77

 
$
2.26

 
$
2.19

 
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings allocated to common shares
$
100,317

 
$
92,567

 
$
92,847

 
$
270,542

 
$
263,536

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares outstanding
120,053

 
119,967

 
120,417

 
119,955

 
120,314

 
 
 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.84

 
$
0.77

 
$
0.77

 
$
2.26

 
$
2.19


________________________
(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.