Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended				3 Months Ended				3 Months Ended			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Covenants not to compete	Dec. 31, 2012 Covenants not to compete	Mar. 31, 2013 Covenants not to compete Minimum	Mar. 31, 2013 Covenants not to compete Maximum	Mar. 31, 2013 Patents	Dec. 31, 2012 Patents	Mar. 31, 2013 Patents Minimum	Mar. 31, 2013 Patents Maximum	Mar. 31, 2013 Manufacturing technology	Dec. 31, 2012 Manufacturing technology	Mar. 31, 2013 Manufacturing technology Maximum	Mar. 31, 2013 Customer relationships, including backlog	Dec. 31, 2012 Customer relationships, including backlog	Mar. 31, 2013 Customer relationships, including backlog Minimum	Mar. 31, 2013 Customer relationships, including backlog Maximum
Summary of intangible assets
Life in Years					2 years	4 years			11 years	13 years			1 year			10 years	19 years
Goodwill	$ 164,965	$ 165,175
Trademarks and trade names	61,078	61,251
Total with indefinite lives	226,043	226,426
Total with finite lives, Gross Amount	116,041	116,328	1,112	1,112			5,320	5,320			2,504	2,563		107,105	107,333
Total intangible assets, Gross Amount	342,084	342,754
Total with finite lives, Accumulated Amortization	$ 37,800	$ 34,418	$ 1,005	$ 985			$ 1,663	$ 1,554			$ 2,504	$ 2,563		$ 32,628	$ 29,316