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Stockholders' Investment (Tables)
3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Schedule of changes in stockholders' investment
 
Three Months Ended March 31,
 
2013
 
2012
Beginning balance
$
392,079

 
$
295,953

Net income
10,582

 
7,931

Other changes
9,566

 
1,160

Ending balance
$
412,227

 
$
305,044