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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
 
 
December 31,
 
 
 
2013
 
2014
 
 
 
(in thousands)
 
 
 
 
 
 
Land
 
$
14,328
 
 
14,328
 
Building and improvements
 
 
18,109
 
 
18,582
 
Machinery
 
 
39,530
 
 
41,154
 
Research and development equipment
 
 
23,030
 
 
25,155
 
Software
 
 
12,080
 
 
12,537
 
Office furniture and equipment
 
 
9,125
 
 
9,968
 
Others
 
 
19,362
 
 
23,516
 
 
 
 
135,564
 
 
145,240
 
Accumulated depreciation and amortization
 
 
(76,997)
 
 
(89,090)
 
Prepayment for purchases of equipment
 
 
2,021
 
 
1,121
 
 
 
$
60,588
 
 
57,271