Segment and Geographic Information Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 356,719	$ 274,092
Net sales	1,498,153	1,318,513	1,146,231
United States [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	281,559	196,381
Net sales	1,313,458	1,158,397	975,501
United Kingdom [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	60,608	62,425
Net sales	41,694	41,944	57,308
Canada [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	488	329
Net sales	30,142	28,053	25,063
Mexico
Segment Reporting Information [Line Items]
Long-Lived Assets	2,609	3,016
Net sales	27,866	24,858	16,773
Germany [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	11,455	11,941
Net sales	17,577	13,191	17,128
Australia/New Zealand [Member]
Segment Reporting Information [Line Items]
Net sales	9,163	10,031	11,537
Other [Member]
Segment Reporting Information [Line Items]
Net sales	$ 58,253	$ 42,039	$ 42,921