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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per share computations
The following are computations of basic and diluted earnings per share (in thousands except for per share amounts):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Numerator for basic and diluted earnings per share:
 
 
 
 
 
Income from continuing operations
$
129,674

 
$
127,252

 
$
127,721

Income from discontinued operations, net of tax
—

 
—

 
2,794

Net income
$
129,674

 
$
127,252

 
$
130,515

Denominator:
 
 
 
 
 
  Basic shares outstanding
53,884

 
52,961

 
52,622

  Dilutive effect of equity-based compensation awards
195

 
363

 
310

  Dilutive shares outstanding
54,079

 
53,324

 
52,932

Basic earnings per share
 
 
 
 
 
Income from continuing operations
$
2.41

 
$
2.40

 
$
2.43

Income from discontinued operations, net of tax
—

 
—

 
0.05

Net income
$
2.41

 
$
2.40

 
$
2.48

Diluted earnings per share
 
 
 
 
 
Income from continuing operations
$
2.40

 
$
2.39

 
$
2.42

Income from discontinued operations, net of tax
—

 
—

 
0.05

Net income
$
2.40

 
2.39

 
2.47