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Principal Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]  
Calculation Of Diluted Earnings Per Share
(Dollars in thousands except per share data)
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
Net income
$
42,897

 
$
41,800

 
$
56,902

 
$
67,446

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Weighted-average common shares outstanding
56,354,017

 
55,809,358

 
56,226,038

 
55,756,540

Stock options and nonvested stock
606,721

 
630,487

 
634,057

 
620,658

 
56,960,738

 
56,439,845

 
56,860,095

 
56,377,198

 
 
 
 
 
 
 
 
Diluted Earnings per Share:
$
0.75

 
$
0.74

 
$
1.00

 
$
1.20

 
 
 
 
 
 
 
 
Anti-dilutive securities excluded from the
 

 
 

 
 
 
 
computation of diluted EPS
1,119,661

 
1,721,576

 
1,119,661

 
1,813,188