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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Note 9.
Property, Plant and Equipment
 
 
 
December 31,
 
 
 
2014
 
2015
 
 
 
(in thousands)
 
 
 
 
 
 
 
Land
 
$
14,328
 
 
14,328
 
Building and improvements
 
 
18,582
 
 
22,460
 
Machinery
 
 
41,154
 
 
42,770
 
Research and development equipment
 
 
25,155
 
 
25,949
 
Software
 
 
12,537
 
 
13,260
 
Office furniture and equipment
 
 
9,968
 
 
10,655
 
Others
 
 
23,516
 
 
24,793
 
 
 
 
145,240
 
 
154,215
 
Accumulated depreciation and amortization
 
 
(89,090)
 
 
(101,373)
 
Prepayment for purchases of land and equipment
 
 
1,121
 
 
1,619
 
 
 
$
57,271
 
 
54,461
 
 
Depreciation and amortization of these assets for the years ended December 31, 2013, 2014 and 2015 were $11,400 thousand, $13,639 thousand and $13,312 thousand, respectively.