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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
Accrued liabilities consisted of the following (in thousands):
 
December 31,
 
2015
 
2014
Payroll and related liabilities
$
6,556

 
$
5,058

Other
6,471

 
4,793

 
$
13,027

 
$
9,851