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Consolidating Financial Information (Consolidating Statements Of Income) (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
Net sales-product                 $ 2,138,127 $ 1,786,076 $ 1,530,122
Rental revenue                 11,431 11,316 0
Total 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]
Cost of goods sold-product                 1,586,145 1,277,505 1,066,862
Cost of rental                 4,386 4,428 0
Total costs                 1,590,531 1,281,933 1,066,862
Gross profit 125,071 145,196 147,796 140,964 126,928 135,922 132,201 120,408 559,027 515,459 463,260
Selling, general, and administrative expenses                 151,602 136,967 114,900
Research, development, and testing expenses                 105,496 91,188 86,072
Gain on legal settlement, net                 38,656 [2] 0 [2] 0 [2]
Operating (loss) profit                 340,585 287,304 262,288
Interest and financing expenses, net                 18,820 17,261 11,716
Other (expense) income , net                 (18,048) (10,047) (11,196)
(Loss) income before income taxes and equity income of subsidiaries                 303,717 259,996 239,376
Income tax (benefit) expense                 96,810 82,871 77,093
Equity income of subsidiaries                 0 0 0
Net income 33,698 71,361 52,259 49,589 49,412 45,719 39,856 42,138 206,907 177,125 162,283
Parent Company [Member]
                      
Net sales-product                 0 0 0
Rental revenue                 0 0 0
Total revenue                 0 0 0
Cost of goods sold-product                 0 0 0
Cost of rental                 0 0 0
Total costs                 0 0 0
Gross profit                 0 0 0
Selling, general, and administrative expenses                 6,159 5,310 4,886
Research, development, and testing expenses                 0 0 0
Gain on legal settlement, net                 0    
Operating (loss) profit                 (6,159) (5,310) (4,886)
Interest and financing expenses, net                 14,398 12,871 12,085
Other (expense) income , net                 (18,558) (10,586) (11,398)
(Loss) income before income taxes and equity income of subsidiaries                 (39,115) (28,767) (28,369)
Income tax (benefit) expense                 (15,400) (11,635) (12,676)
Equity income of subsidiaries                 230,622 194,257 177,976
Net income                 206,907 177,125 162,283
Guarantor Subsidiaries [Member]
                      
Net sales-product                 842,294 744,288 845,285
Rental revenue                 11,431 11,316 0
Total revenue                 853,725 755,604 845,285
Cost of goods sold-product                 460,240 396,483 455,484
Cost of rental                 4,386 4,428 0
Total costs                 464,626 400,911 455,484
Gross profit                 389,099 354,693 389,801
Selling, general, and administrative expenses                 108,970 101,495 95,978
Research, development, and testing expenses                 77,569 69,914 67,356
Gain on legal settlement, net                 38,656    
Operating (loss) profit                 241,216 183,284 226,467
Interest and financing expenses, net                 1,266 2,032 (550)
Other (expense) income , net                 1,885 (93) 85
(Loss) income before income taxes and equity income of subsidiaries                 241,835 181,159 227,102
Income tax (benefit) expense                 83,348 62,580 76,673
Equity income of subsidiaries                 0 0 0
Net income                 158,487 118,579 150,429
Non-Guarantor Subsidiaries [Member]
                      
Net sales-product                 1,295,833 1,041,788 684,837
Rental revenue                 0 0 0
Total revenue                 1,295,833 1,041,788 684,837
Cost of goods sold-product                 1,125,905 881,022 611,378
Cost of rental                 0 0 0
Total costs                 1,125,905 881,022 611,378
Gross profit                 169,928 160,766 73,459
Selling, general, and administrative expenses                 36,473 30,162 14,036
Research, development, and testing expenses                 27,927 21,274 18,716
Gain on legal settlement, net                 0    
Operating (loss) profit                 105,528 109,330 40,707
Interest and financing expenses, net                 3,156 2,358 181
Other (expense) income , net                 (1,375) 632 117
(Loss) income before income taxes and equity income of subsidiaries                 100,997 107,604 40,643
Income tax (benefit) expense                 28,862 31,926 13,096
Equity income of subsidiaries                 0 0 0
Net income                 72,135 75,678 27,547
Total Consolidating Adjustments [Member]
                      
Net sales-product                 0 0 0
Rental revenue                 0 0 0
Total revenue                 0 0 0
Cost of goods sold-product                 0 0 0
Cost of rental                 0 0 0
Total costs                 0 0 0
Gross profit                 0 0 0
Selling, general, and administrative expenses                 0 0 0
Research, development, and testing expenses                 0 0 0
Gain on legal settlement, net                 0    
Operating (loss) profit                 0 0 0
Interest and financing expenses, net                 0 0 0
Other (expense) income , net                 0 0 0
(Loss) income before income taxes and equity income of subsidiaries                 0 0 0
Income tax (benefit) expense                 0 0 0
Equity income of subsidiaries                 (230,622) (194,257) (177,976)
Net income                 $ (230,622) $ (194,257) $ (177,976)
[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.