Annual report pursuant to Section 13 and 15(d)

EQUIPMENT AND PROPERTY (Details)

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EQUIPMENT AND PROPERTY (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
EQUIPMENT AND PROPERTY      
Less Accumulated Depreciation $ 125,667,000 $ 121,540,000  
Net equipment and property 76,858,000 74,013,000  
Equipment and property, net held in foreign countries 2,600,000 2,000,000  
Depreciation expense 15,112,000 15,975,000 15,874,000
Plant and Equipment
     
EQUIPMENT AND PROPERTY      
Gross equipment and property 178,858,000 171,868,000  
Net equipment and property 53,191,000 50,328,000  
Buildings
     
EQUIPMENT AND PROPERTY      
Gross equipment and property 43,842,000 42,995,000  
Operating Equipment
     
EQUIPMENT AND PROPERTY      
Gross equipment and property 70,932,000 67,739,000  
Furniture and Fixtures
     
EQUIPMENT AND PROPERTY      
Gross equipment and property 11,809,000 11,375,000  
Computer Equipment and Systems
     
EQUIPMENT AND PROPERTY      
Gross equipment and property 52,275,000 49,759,000  
Land
     
EQUIPMENT AND PROPERTY      
Gross equipment and property $ 23,667,000 $ 23,685,000