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Segment And Geographic Area Information (Schedule Of Revenue, Total Assets And Long-Lived Assets By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
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 $ 557,396 $ 578,523 $ 508,083 $ 460,648 $ 471,777 $ 469,841 $ 395,126 $ 2,149,558 [1] $ 1,797,392 [1] $ 1,530,122 [1]
Total assets 1,191,662       1,062,741       1,191,662 1,062,741 1,025,192
Long-lived assets 352,966       333,976       352,966 333,976 302,415
Percentage of consolidated revenue or long lived assets                 10.00% 10.00% 10.00%
United States [Member]
                      
Segment Reporting Information [Line Items]                      
Consolidated revenue                 767,715 650,781 604,592
Total assets 634,939       590,216       634,939 590,216 637,227
Long-lived assets 256,998       255,785       256,998 255,785 256,901
Foreign [Member]
                      
Segment Reporting Information [Line Items]                      
Consolidated revenue                 1,381,843 1,146,611 925,530
Total assets 556,723       472,525       556,723 472,525 387,965
Long-lived assets $ 95,968       $ 78,191       $ 95,968 $ 78,191 $ 45,514
[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.