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OTHER INCOME (EXPENSE) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Interest and Other Income [Table Text Block] Other income (expense) consisted of the following for the years set forth below (amounts in thousands):
 
2017
 
2016
 
2015
Equity investment income
$
3,615

 
$
2,977

 
$
1,790

Interest income
3,363

 
3,206

 
2,667

Investment gain (loss) related to investments for deferred compensation
2,725

 
190

 
(361
)
Building rental income
2,372

 
2,109

 
936

Discount amortization on prepaid royalty
866

 
1,491

 
1,956

Gain (loss) on sale of assets
(701
)
 
2,229

 
2,418

Other income (expense)
(1,099
)
 
264

 
1,657

 
$
11,141

 
$
12,466

 
$
11,063