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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, 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
Revenue:                      
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]
Costs:                      
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 profit                 340,585 287,304 262,288
Interest and financing expenses, net                 18,820 17,261 11,716
Other expense, net                 18,048 10,047 11,196
Income before income tax expense                 303,717 259,996 239,376
Income tax expense                 96,810 82,871 77,093
Net income $ 33,698 $ 71,361 $ 52,259 $ 49,589 $ 49,412 $ 45,719 $ 39,856 $ 42,138 $ 206,907 $ 177,125 $ 162,283
Basic earnings per share $ 2.51 $ 5.22 $ 3.77 $ 3.57 $ 3.48 $ 3.19 $ 2.69 $ 2.79 $ 15.10 $ 12.12 $ 10.67
Diluted earnings per share $ 2.51 $ 5.22 $ 3.77 $ 3.57 $ 3.47 $ 3.18 $ 2.69 $ 2.78 $ 15.09 $ 12.09 $ 10.65
Shares used to compute basic earnings per share 13,405 13,680 13,852 13,890 14,209 14,353 14,796 15,118 13,707 14,619 15,206
Shares used to compute diluted earnings per share 13,405 13,680 13,856 13,906 14,235 14,383 14,828 15,154 13,712 14,650 15,243
[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.