Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Non-compete agreements [Member]	Mar. 31, 2013 Non-compete agreements [Member]	Dec. 31, 2012 Patents [Member]	Mar. 31, 2013 Patents [Member]	Dec. 31, 2012 Customer relationships [Member]	Mar. 31, 2013 Customer relationships [Member]	Dec. 31, 2012 Supplier relationships [Member]	Mar. 31, 2013 Supplier relationships [Member]	Dec. 31, 2012 Trademarks [Member]	Mar. 31, 2013 Trademarks [Member]	Dec. 31, 2012 Technology [Member]	Mar. 31, 2013 Technology [Member]	Mar. 31, 2013 Weighted Average [Member]	Mar. 31, 2013 Weighted Average [Member] Non-compete agreements [Member]	Mar. 31, 2013 Weighted Average [Member] Patents [Member]	Mar. 31, 2013 Weighted Average [Member] Customer relationships [Member]	Mar. 31, 2013 Weighted Average [Member] Supplier relationships [Member]	Mar. 31, 2013 Weighted Average [Member] Trademarks [Member]	Mar. 31, 2013 Weighted Average [Member] Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period In Years			5 years		10 years		23 years		5 years		17 years		18 years		20 years	5 years	10 years	23 years	5 years	17 years	18 years
Gross Carrying Value	$ 46,811	$ 46,811	$ 380	$ 380	$ 815	$ 815	$ 19,960	$ 19,960	$ 350	$ 350	$ 6,280	$ 6,280	$ 19,026	$ 19,026
Accumulated Amortization	(7,347)	(6,646)	(367)	(369)	(412)	(421)	(2,488)	(2,760)	(143)	(161)	(879)	(987)	(2,357)	(2,649)
Net Carrying Amount	$ 39,464	$ 40,165	$ 13	$ 11	$ 403	$ 394	$ 17,472	$ 17,200	$ 207	$ 189	$ 5,401	$ 5,293	$ 16,669	$ 16,377