Acquisitions (Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Acquisitions
Net sales, Pro forma	$ 486,895	$ 426,364	$ 963,031	$ 827,526
Net income, Pro forma	$ 50,810	$ 39,032	$ 99,875	$ 66,406
Diluted earnings per share, Pro forma	$ 0.61	$ 0.48	$ 1.19	$ 0.81

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph r(2, 3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 54

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 55

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Period Type:	duration