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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Operating Leases of Lessee Disclosure [Table Text Block]

Future minimum lease payments under non-cancelable operating leases as of December 31, 2012 are as follows (in thousands):

 

Year      
       
2013   $ 2,013  
2014     2,013  
2015     1,994  
2016     1,663  
2017     1,569  
2018 and thereafter       4,345  
Total minimum lease payments     $ 13,597