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Segment And Geographic Area Information (Schedule Of Asset Information By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 50,370 $ 49,192 $ 151,831 $ 21,761
Short-term investments 0 300 300  
Other accounts receivable 278,332 257,748    
Deferred income taxes 43,066 28,850 38,788  
Prepaid expenses 36,943 15,358 38,975  
Non-segment property, plant and equipment, net 352,966 333,976 302,415  
Prepaid pension cost 11,494 8,597 2,430  
Other assets and deferred charges 73,619 48,893    
TOTAL ASSETS 1,191,662 1,062,741 1,025,192  
Additions to long-lived assets 53,515 46,636 90,633  
Depreciation and amortization 43,352 39,134 32,820  
Operating Segments [Member]
        
Segment Reporting Information [Line Items]        
TOTAL ASSETS 977,421 898,445 744,610  
Petroleum Additives [Member]
        
Segment Reporting Information [Line Items]        
TOTAL ASSETS 854,134 768,814 613,852  
Additions to long-lived assets 50,760 42,908 37,173  
Depreciation and amortization 36,604 32,454 30,098  
Real Estate Development [Member]
        
Segment Reporting Information [Line Items]        
TOTAL ASSETS 109,162 112,385 113,125  
Additions to long-lived assets 0 2,046 53,030  
Depreciation and amortization 4,091 4,065 0  
All Other [Member]
        
Segment Reporting Information [Line Items]        
TOTAL ASSETS 14,125 17,246 17,633  
Additions to long-lived assets 30 51 25  
Depreciation and amortization 112 98 94  
Corporate [Member]
        
Segment Reporting Information [Line Items]        
Additions to long-lived assets 2,725 1,631 405  
Depreciation and amortization 2,545 2,517 2,628  
Unallocated Amount To Segment [Member]
        
Segment Reporting Information [Line Items]        
Other accounts receivable 173 5,906 379  
Non-segment property, plant and equipment, net 24,791 23,315 23,951  
Other assets and deferred charges $ 47,404 $ 32,778 $ 23,928