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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of earnings per share
The table below provides the reconciliation of the earnings and number of shares used in the Company's calculations of basic and diluted earnings per share. 
 
Quarters Ended March 31,
 
2013
 
2012
(in thousands, except for per share data)
 
Basic earnings per common share
 
 
 
Net Earnings
$
135,369

 
$
170,719

Less: Distributed and undistributed earnings allocated to participating securities
(1,155
)
 
(2,472
)
Net earnings allocable to common shares
$
134,214

 
$
168,247

 
 
 
 
Basic weighted average common shares outstanding
133,464

 
139,323

Basic earnings per common share
$
1.01

 
$
1.21

 
 
 
 
Diluted earnings per common share
 

 
 

Net Earnings
$
135,369

 
$
170,719

Less: Distributed and undistributed earnings allocated to participating securities
(1,149
)
 
(2,459
)
Net earnings allocable to common shares
$
134,220

 
$
168,260

 
 
 
 
Basic weighted average common shares outstanding
133,464

 
139,323

Effect of dilutive options
836

 
844

Diluted weighted average common shares outstanding
134,300

 
140,167

Diluted earnings per common share
$
1.00

 
$
1.20