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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Capital Stock Additional Information [Abstract]  
Schedule Of Common Stock Activity
Common stock activity is summarized as follows:
 
 
Shares
 
Dollars
(Dollars in thousands)
 
Issued
 
Treasury
 
Common
Stock
 
Treasury
Cost
Balances January 1, 2015
 
62,081,391

 
(24,633,081
)
 
$
148,401

 
$
(284,805
)
Restricted stock awards
 
—

 
34,624

 
(404
)
 
404

Restricted stock expense
 
—

 
—

 
3,461

 
—

Restricted stock forfeitures
 
—

 
(18,468
)
 
(426
)
 
—

Stock options exercised
 
—

 
64,752

 
1,714

 
216

Stock option expense
 
—

 
—

 
2,572

 
—

Stock option forfeitures
 
—

 
—

 
(118
)
 
—

Performance stock issued
 
—

 
52,839

 
(616
)
 
616

Performance stock expense
 
—

 
—

 
2,265

 
—

Performance stock forfeitures
 
—

 
—

 
(155
)
 
—

Employee stock purchase plan
 
—

 
11,517

 
352

 
136

Tax benefit related to stock plans
 
—

 
—

 
597

 
—

Treasury shares purchased for stock compensation programs
 
—

 
(71,100
)
 
—

 
(2,781
)
Share repurchase program
 
—

 
(150,000
)
 
$
—

 
$
(7,104
)
Balances December 31, 2015
 
62,081,391

 
(24,708,917
)
 
$
157,643

 
$
(293,318
)
Restricted stock awards
 
—

 
29,836

 
(355
)
 
355

Restricted stock expense
 
—

 
—

 
3,604

 
—

Restricted stock forfeitures
 
—

 
(2,800
)
 
(148
)
 
—

Stock options exercised
 
—

 
341,063

 
5,617

 
6,859

Stock option expense
 
—

 
—

 
2,484

 
—

Stock option forfeitures
 
—

 
—

 
(25
)
 
—

Performance stock issued
 
—

 
31,093

 
(371
)
 
371

Performance stock expense
 
—

 
—

 
3,324

 
—

Performance stock forfeitures
 
—

 
—

 
(28
)
 
—

Employee stock purchase plan
 
—

 
9,500

 
458

 
113

Tax benefit related to stock plans
 
—

 
—

 
478

 
—

Treasury shares purchased for stock compensation programs
 
—

 
(44,588
)
 
—

 
(1,881
)
Balances December 31, 2016
 
62,081,391

 
(24,344,813
)
 
$
172,681

 
$
(287,501
)
Restricted stock awards
 
—

 
34,798

 
(422
)
 
422

Restricted stock expense
 
—

 
—

 
4,746

 
—

Restricted stock forfeitures
 
—

 
(690
)
 
(49
)
 
(6
)
Stock options exercised
 
—

 
620,646

 
10,901

 
7,564

Stock option expense
 


 
—

 
380

 
—

Performance stock issued
 
—

 
72,504

 
(866
)
 
866

Performance stock expense
 
—

 
—

 
6,687

 
—

Employee stock purchase plan
 
—

 
7,127

 
445

 
87

Treasury shares purchased for stock compensation programs
 
—

 
(79,094
)
 
—

 
(5,732
)
Share repurchase program
 
—

 
(168,941
)
 
—

 
(11,781
)
Acquisition of noncontrolling interest
 
—

 
—

 
450

 
—

Balances December 31, 2017
 
62,081,391

 
(23,858,463
)
 
$
194,953

 
$
(296,081
)