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Earnings Per Share Information (Tables)
12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per common share from continuing operations
The following table presents the calculation of basic and diluted earnings per common share from continuing operations:
 
 
Years ended December 31,
 
 
2012
 
2011
 
2010
 
 
(In thousands, except per share amounts)
Earnings per share — Basic:
 
 
 
 
 
 
Earnings from continuing operations
 
$
200,899

 
171,368

 
124,608

Less: Distributed and undistributed earnings allocated to nonvested stock
 
(2,566
)
 
(2,751
)
 
(1,759
)
Earnings from continuing operations available to common shareholders — Basic
 
$
198,333

 
168,617

 
122,849

 
 
 
 
 
 
 
Weighted average common shares outstanding— Basic
 
50,449

 
50,500

 
51,717

 
 
 
 
 
 
 
Earnings from continuing operations per common share — Basic
 
$
3.93

 
3.34

 
2.38

 
 
 
 
 
 
 
Earnings per share — Diluted:
 
 
 
 
 
 
Earnings from continuing operations
 
$
200,899

 
171,368

 
124,608

Less: Distributed and undistributed earnings allocated to nonvested stock
 
(2,556
)
 
(2,737
)
 
(1,756
)
Earnings from continuing operations available to common shareholders — Diluted
 
$
198,343

 
168,631

 
122,852

 
 
 
 
 
 
 
Weighted average common shares outstanding— Basic
 
50,449

 
50,500

 
51,717

Effect of dilutive equity awards
 
291

 
378

 
167

Weighted average common shares outstanding— Diluted
 
50,740

 
50,878

 
51,884

 
 
 
 
 
 
 
Earnings from continuing operations per common share — Diluted
 
$
3.91

 
3.31

 
2.37

Anti-dilutive equity awards and market-based restrictive stocks rights not included above
 
2,278

 
1,514

 
1,654