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Segment And Geographic Area Information (Schedule Of Revenue And Operating Profit By Segment) (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Sep. 20, 2011
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]                        
Consolidated revenue   $ 505,556,000 $ 557,396,000 $ 578,523,000 $ 508,083,000 $ 460,648,000 $ 471,777,000 $ 469,841,000 $ 395,126,000 $ 2,149,558,000 [1] $ 1,797,392,000 [1] $ 1,530,122,000 [1]
Gain on legal settlement, net                   38,656,000 [2] 0 [2] 0 [2]
Segment operating profit                   358,185,000 308,456,000 279,352,000
Corporate, general, and administrative expenses                   (151,602,000) (136,967,000) (114,900,000)
Interest and financing expenses, net                   (18,820,000) (17,261,000) (11,716,000)
Loss on interest rate swap agreement                   (17,516,000) [3] (10,324,000) [3] (11,440,000) [3]
Other (expense) income, net                   (1,423,000) (545,000) 213,000
Income before income tax expense                   303,717,000 259,996,000 239,376,000
Number of customers that exceeded threshold percentage                   1 1 1
Settlement agreement aggregate amount                   45,000,000    
Proceeds from Legal Settlements 25,000,000                 25,000,000 0 0
Settlement agreement, stock issued for settlement, value                   5,000,000    
Settlement agreement, stock issued for settlement, shares                   195,313    
Settlement agreement, promissory notes issued, amount                   15,000,000    
Number of installments in promissory note payable                   3    
Annual installments amount                   5,000,000    
Litigation settlement, installment due date                   September 10, 2012    
Percentage of simple interest on promissory note                   1.00%    
Petroleum Additives [Member]
                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   2,126,444,000 1,774,372,000 1,518,138,000
Segment operating profit                   348,282,000 299,053,000 279,800,000
Real Estate Development [Member]
                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   11,431,000 11,316,000 0
Segment operating profit                   7,042,000 7,000,000 (391,000)
All Other [Member]
                        
Segment Reporting Information [Line Items]                        
Consolidated revenue                   11,683,000 11,704,000 11,984,000
Segment operating profit                   2,861,000 2,403,000 (57,000)
Petroleum Additives Before Gain On Legal Settlement, Net [Member]
                        
Segment Reporting Information [Line Items]                        
Petroleum additives before gain on legal settlement, net                   309,626,000 299,053,000 279,800,000
Unallocated Amount To Segment [Member]
                        
Segment Reporting Information [Line Items]                        
Corporate, general, and administrative expenses                   (16,709,000) (20,330,000) (17,033,000)
Shell [Member]
                        
Segment Reporting Information [Line Items]                        
Net sales to individual customers exceeding 10% of consolidated revenue                   $ 246,000,000 $ 217,000,000 $ 232,000,000
Percentage of consolidated revenue                   11.00% 12.00% 15.00%
[1] Net sales to one customer of our petroleum additives segment exceeded 10% of consolidated revenue in 2011, 2010, and 2009. Sales to Royal Dutch Shell plc and its affiliates (Shell) amounted to $246 million (11% of consolidated revenue) in 2011, $217 million (12% of consolidated revenue) in 2010, and $232 million (15% of consolidated revenue) in 2009. These sales represent a wide-range of products sold to this customer in multiple regions of the world.
[2] For 2011, the petroleum additives segment includes a net gain of $38.7 million related to a legal settlement. See Note 18 for additional information.
[3] The loss on the interest rate swap agreement represents the change, since the beginning of the reporting period, in the fair value of an interest rate swap which we entered into on June 25, 2009. We are not using hedge accounting to record the interest rate swap, and accordingly, any change in the fair value is immediately recognized in earnings.