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Earnings Per Share (EPS)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share (EPS)
Note 3.   Earnings Per Share (EPS)

(thousands, except per share amounts)
 
2012
 
 
 
2011
 
 
 
2010
 
Basic EPS
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to MTI  
$
74,147
 
 
$
67,521
 
 
$
66,869
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding  
 
35,340
 
 
 
36,018
 
 
 
37,228
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings  per share attributable to MTI  
$
2.10
 
 
$
1.87
 
 
$
1.80
 
 
 
 
 
 
 
 
 
 
 
 
 

Diluted EPS
 
2012
 
 
 
2011
 
 
 
2010
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to MTI  
$
74,147
 
 
$
67,521
 
 
$
66,869
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average shares outstanding  
 
35,340
 
 
 
36,018
 
 
 
37,228
 
Dilutive effect of stock options  
 
189
 
 
 
218
 
 
 
158
 
Weighted average shares outstanding, adjusted  
 
35,529
 
 
 
36,236
 
 
 
37,386
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted earnings per share  
$
2.09
 
 
$
1.86
 
 
$
1.79
 

     Options to purchase 2,404 shares, 218,064 shares and 193,602 shares of common stock for the years ended December 31, 2012, December 31, 2011 and December 31, 2010, respectively, were not included in the computation of diluted earnings per share because they were anti-dilutive, as the exercise prices of the options were greater than the average market price of the common shares.