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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
June 30,
 
September 30,
 
September 30,
 
2018
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands, except per share data)
Basic Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings
$
116,287

 
$
115,735

 
$
101,466

 
$
350,298

 
$
273,781

Less: Earnings allocated to unvested restricted stock(1)
(1,428
)
 
(1,348
)
 
(1,149
)
 
(3,899
)
 
(3,239
)
Net earnings allocated to common shares
$
114,859

 
$
114,387

 
$
100,317

 
$
346,399

 
$
270,542

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares and unvested restricted
 
 
 
 
 
 
 
 
 
stock outstanding
123,657

 
126,082

 
121,447

 
125,728

 
121,405

Less: Weighted-average unvested restricted stock
 
 
 
 
 
 
 
 
 
outstanding
(1,537
)
 
(1,466
)
 
(1,394
)
 
(1,473
)
 
(1,450
)
Weighted-average basic shares outstanding
122,120

 
124,616

 
120,053

 
124,255

 
119,955

 
 
 
 
 
 
 
 
 
 
Basic earnings per share
$
0.94

 
$
0.92

 
$
0.84

 
$
2.79

 
$
2.26

 
 
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
 
 
Net earnings allocated to common shares
$
114,859

 
$
114,387

 
$
100,317

 
$
346,399

 
$
270,542

 
 
 
 
 
 
 
 
 
 
Weighted-average basic shares outstanding
122,120

 
124,616

 
120,053

 
124,255

 
119,955

 
 
 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.94

 
$
0.92

 
$
0.84

 
$
2.79

 
$
2.26


________________________
(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.