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Commitments (Tables)
12 Months Ended
Dec. 31, 2011
Commitments [Abstract]  
Schedule Of Future Minimum Rental Payments For Operating Leases [Table Text Block]

Future minimum lease payments under non-cancelable operating leases at December 31, 2011 are:

2012 $ 5,487
2013   4,307
2014   997
2015   208
2016 and thereafter   180
  $ 11,179