Annual report pursuant to Section 13 and 15(d)

EQUIPMENT AND PROPERTY (Details)

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EQUIPMENT AND PROPERTY (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Net equipment and property $ 136,885 $ 134,088  
Depreciation expense 30,364 27,381 $ 24,725
Foreign Countries [Member]      
Property, Plant and Equipment [Line Items]      
Net equipment and property 7,600 4,900  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 53,339 51,023  
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 103,429 91,430  
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 18,476 17,672  
Computer Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 177,441 163,220  
Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 352,685 323,345  
Less--Accumulated Depreciation (240,320) (213,809)  
Net equipment and property 112,365 109,536  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Gross equipment and property $ 24,520 $ 24,552