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Commitments (Tables)
12 Months Ended
Dec. 31, 2012
Commitments [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
At December 31, 2012, the minimum payments under our operating leases for each of the five succeeding fiscal years were as follows (in thousands):
2013
$
5,602

2014
5,367

2015
5,188

2016
4,909

2017
4,218

Thereafter
20,303

Total
$
45,587