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Commitments, Contingencies and Guarantees (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Minimum rental commitments for the rental of office and production premises and equipment under non-cancellable leases net of sublease income, some of which provide for rental adjustments due to increased property taxes and operating costs for 2012 and thereafter, are as follows:
 
Period
 
Amount
 
2013
 
$
37,533
 
2014
 
 
36,647
 
2015
 
 
34,839
 
2016
 
 
30,132
 
2017
 
 
26,078
 
2018 and thereafter
 
 
95,427
 
 
 
$
260,656