Annual report pursuant to Section 13 and 15(d)

LONG-LIVED ASSETS, Property, Plant and Equipment (Details)

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LONG-LIVED ASSETS, Property, Plant and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Abstract]      
Impairment charge $ 4,266,000 $ 10,030,000 $ 16,400,000
Change in estimate [Abstract]      
Change in accounting estimate, financial effect on depreciation expense     $ 4,500,000