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Principal Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
41,800

 
$
29,422

 
$
67,446

 
$
36,344

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 
 
 
Weighted-average common shares outstanding
55,809,358

 
55,413,243

 
55,756,540

 
55,227,528

Stock options and nonvested stock
630,487

 
722,822

 
620,658

 
711,802

 
56,439,845

 
56,136,065

 
56,377,198

 
55,939,330

 
 
 
 
 
 
 
 
Diluted Earnings per Share:
$
0.74

 
$
0.52

 
$
1.20

 
$
0.65

 
 
 
 
 
 
 
 
Anti-dilutive securities excluded from the
 

 
 

 
 
 
 
computation of diluted EPS
1,721,576

 
2,004,579

 
1,813,188

 
2,004,579