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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2011
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
 
 
2011
 
2010
Salaries and benefits
 
$
7,642

 
$
6,029

Incentive compensation
 
3,627

 
2,990

Value Added Tax accrual
 
1,114

 
2,322

Other
 
3,676

 
3,288

 
 
$
16,059

 
$
14,629