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Segment Information (Consolidated Revenue By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Information [Line Items]    
Consolidated revenue $ 562,608 $ 562,679
Petroleum Additives [Member]
   
Segment Information [Line Items]    
Consolidated revenue 558,400 557,692
Real Estate Development [Member]
   
Segment Information [Line Items]    
Consolidated revenue 2,858 2,858
All Other [Member]
   
Segment Information [Line Items]    
Consolidated revenue 1,350 2,129
Lubricant Additives [Member] | Petroleum Additives [Member]
   
Segment Information [Line Items]    
Consolidated revenue 452,672 444,545
Fuel Additives [Member] | Petroleum Additives [Member]
   
Segment Information [Line Items]    
Consolidated revenue $ 105,728 $ 113,147