Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Provisions for depreciation      
Depreciation $ 15,212 $ 15,112 $ 15,975
Buildings | Minimum
     
EQUIPMENT AND PROPERTY      
Useful lives of the assets 10 years    
Buildings | Maximum
     
EQUIPMENT AND PROPERTY      
Useful lives of the assets 40 years    
Furniture, fixtures, and operating equipment | Minimum
     
EQUIPMENT AND PROPERTY      
Useful lives of the assets 2 years    
Furniture, fixtures, and operating equipment | Maximum
     
EQUIPMENT AND PROPERTY      
Useful lives of the assets 10 years