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Employee benefit plans (Tables)
12 Months Ended
Dec. 31, 2013
Employee benefit plans [Abstract]  
Expense recognized for profit sharing, cash bonus, and 401(k) plans
Expense recognized in the consolidated statements of income for these plans was as follows for the years ended December 31:
 
 
2013
 
2012
 
2011
Profit sharing/cash bonus plans
 
$
25,561

 
$
33,007

 
$
16,361

401(k) plan
 
7,004

 
6,680

 
6,226