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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2014
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
Accrued liabilities consisted of the following (in thousands):
 
December 31,
 
2014
 
2013
Payroll and related liabilities
$
5,058

 
$
4,244

Other
4,793

 
4,879

 
$
9,851

 
$
9,123