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, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Net equipment and property $ 134,088 $ 133,477  
Depreciation expense 27,381 24,725 $ 19,354
Foreign countries      
Property, Plant and Equipment [Line Items]      
Net equipment and property 4,900 4,600  
Buildings      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 51,023 50,119  
Operating equipment      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 91,430 82,196  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 17,672 16,255  
Computer equipment and systems      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 163,220 150,661  
Equipment and Property      
Property, Plant and Equipment [Line Items]      
Gross equipment and property 323,345 299,231  
Less--Accumulated Depreciation (213,809) (190,279)  
Net equipment and property 109,536 108,952  
Land      
Property, Plant and Equipment [Line Items]      
Gross equipment and property $ 24,552 $ 24,525