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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
The major classes of assets and total accumulated depreciation and amortization are as follows:
 
 
 
December 31,
 
Average Useful Life
 
2017
 
2016
Land and building
 
 
$
767

 
$
767

Leasehold improvements
 
 
81,554

 
79,165

Machinery and equipment
10 years
 
7,132

 
11,112

Furniture and fixtures
5 years
 
8,629

 
8,881

Computer equipment and software
3 to 5 years
 
58,448

 
57,855

 
 
 
156,530

 
157,780

Less accumulated depreciation and amortization
 
 
(85,032
)
 
(85,399
)
Property and equipment - net
 
 
$
71,498

 
$
72,381